diff --git a/src/tint/cmd/fuzz/wgsl/dictionary.txt b/src/tint/cmd/fuzz/wgsl/dictionary.txt
index a8a1694..fde58b9 100644
--- a/src/tint/cmd/fuzz/wgsl/dictionary.txt
+++ b/src/tint/cmd/fuzz/wgsl/dictionary.txt
@@ -159,6 +159,7 @@
 "chromium_experimental_subgroups"
 "chromium_internal_dual_source_blending"
 "chromium_internal_graphite"
+"chromium_internal_input_attachments"
 "chromium_internal_relaxed_uniform_layout"
 "chromium_testing_experimental"
 "chromium_testing_shipped"
diff --git a/src/tint/lang/wgsl/extension.cc b/src/tint/lang/wgsl/extension.cc
index 1240173..e6790ec 100644
--- a/src/tint/lang/wgsl/extension.cc
+++ b/src/tint/lang/wgsl/extension.cc
@@ -63,6 +63,9 @@
     if (str == "chromium_internal_graphite") {
         return Extension::kChromiumInternalGraphite;
     }
+    if (str == "chromium_internal_input_attachments") {
+        return Extension::kChromiumInternalInputAttachments;
+    }
     if (str == "chromium_internal_relaxed_uniform_layout") {
         return Extension::kChromiumInternalRelaxedUniformLayout;
     }
@@ -90,6 +93,8 @@
             return "chromium_internal_dual_source_blending";
         case Extension::kChromiumInternalGraphite:
             return "chromium_internal_graphite";
+        case Extension::kChromiumInternalInputAttachments:
+            return "chromium_internal_input_attachments";
         case Extension::kChromiumInternalRelaxedUniformLayout:
             return "chromium_internal_relaxed_uniform_layout";
         case Extension::kF16:
diff --git a/src/tint/lang/wgsl/extension.h b/src/tint/lang/wgsl/extension.h
index 3eccedf..ed1ee13 100644
--- a/src/tint/lang/wgsl/extension.h
+++ b/src/tint/lang/wgsl/extension.h
@@ -53,6 +53,7 @@
     kChromiumExperimentalSubgroups,
     kChromiumInternalDualSourceBlending,
     kChromiumInternalGraphite,
+    kChromiumInternalInputAttachments,
     kChromiumInternalRelaxedUniformLayout,
     kF16,
 };
@@ -82,6 +83,7 @@
     "chromium_experimental_subgroups",
     "chromium_internal_dual_source_blending",
     "chromium_internal_graphite",
+    "chromium_internal_input_attachments",
     "chromium_internal_relaxed_uniform_layout",
     "f16",
 };
@@ -95,6 +97,7 @@
     Extension::kChromiumExperimentalSubgroups,
     Extension::kChromiumInternalDualSourceBlending,
     Extension::kChromiumInternalGraphite,
+    Extension::kChromiumInternalInputAttachments,
     Extension::kChromiumInternalRelaxedUniformLayout,
     Extension::kF16,
 };
diff --git a/src/tint/lang/wgsl/extension_bench.cc b/src/tint/lang/wgsl/extension_bench.cc
index c2128d3..7e209ff 100644
--- a/src/tint/lang/wgsl/extension_bench.cc
+++ b/src/tint/lang/wgsl/extension_bench.cc
@@ -94,20 +94,27 @@
         "chromium_intenalNNgraphite",
         "chromiuminternal_gvaphite",
         "chromium_internal_grphitQQ",
-        "chromirm_intenal_rfflaxed_unifrm_layout",
-        "chromium_internal_jelaxed_uniform_layout",
-        "chromium_interna_relNNxed_uwwiform_lay82t",
+        "chromirm_ffnternalinpt_attachments",
+        "chromium_internal_input_attachmenjs",
+        "chwwomiu2_interNNal_inpu_att8chments",
+        "chromium_internal_input_attachments",
+        "chromium_internalinput_attachments",
+        "crrromium_internal_input_attachments",
+        "Ghromium_internal_input_attachments",
+        "chromium_internalFFrelaxed_uniform_layout",
+        "chromEum_internal_relaxed_unifrmlyout",
+        "chromium_internalrrrelaxd_uniform_layout",
         "chromium_internal_relaxed_uniform_layout",
-        "chromium_internal_relaxed_uniform_layut",
-        "chromium_internal_relaxed_rrniform_layout",
-        "chromium_internal_relaxedGuniform_layout",
-        "FF16",
-        "",
-        "rr1",
+        "chromiuminternal_relaxed_uniform_layut",
+        "cXroDium_internal_rJJlaed_uniform_layout",
+        "chromium_int8nal_relaed_uniform_layut",
+        "k",
+        "16",
+        "J1",
         "f16",
-        "1",
-        "DJ1",
-        "",
+        "c16",
+        "fO6",
+        "_KKttvv",
     };
     for (auto _ : state) {
         for (auto* str : kStrings) {
diff --git a/src/tint/lang/wgsl/extension_test.cc b/src/tint/lang/wgsl/extension_test.cc
index 11a75b0..9e6c182 100644
--- a/src/tint/lang/wgsl/extension_test.cc
+++ b/src/tint/lang/wgsl/extension_test.cc
@@ -64,6 +64,7 @@
     {"chromium_experimental_subgroups", Extension::kChromiumExperimentalSubgroups},
     {"chromium_internal_dual_source_blending", Extension::kChromiumInternalDualSourceBlending},
     {"chromium_internal_graphite", Extension::kChromiumInternalGraphite},
+    {"chromium_internal_input_attachments", Extension::kChromiumInternalInputAttachments},
     {"chromium_internal_relaxed_uniform_layout", Extension::kChromiumInternalRelaxedUniformLayout},
     {"f16", Extension::kF16},
 };
@@ -90,12 +91,15 @@
     {"chromi44m_internal_graphite", Extension::kUndefined},
     {"chromSSuVV_internal_graphite", Extension::kUndefined},
     {"cRromium_nternR22_graphite", Extension::kUndefined},
-    {"chromium_int9rnal_relaxed_Fnifor_layout", Extension::kUndefined},
-    {"chrmium_internal_relaxed_uniform_layout", Extension::kUndefined},
-    {"VRhHomium_internal_relaxd_uniform_OOayout", Extension::kUndefined},
-    {"y1", Extension::kUndefined},
-    {"l77rrn6", Extension::kUndefined},
-    {"4016", Extension::kUndefined},
+    {"chromium_int9rnaF_inpu_attachments", Extension::kUndefined},
+    {"chrmium_internal_input_attachments", Extension::kUndefined},
+    {"cOOromium_internVlHinput_ttachRRents", Extension::kUndefined},
+    {"chromium_internl_relaxyd_uniform_layout", Extension::kUndefined},
+    {"chromnnum_internrr77_Gelaxell_uniform_layout", Extension::kUndefined},
+    {"chromium_intern4l_relaxe00_uniform_layout", Extension::kUndefined},
+    {"5", Extension::kUndefined},
+    {"u16", Extension::kUndefined},
+    {"f", Extension::kUndefined},
 };
 
 using ExtensionParseTest = testing::TestWithParam<Case>;
diff --git a/src/tint/lang/wgsl/reader/parser/enable_directive_test.cc b/src/tint/lang/wgsl/reader/parser/enable_directive_test.cc
index adb1d1c..34d0d00 100644
--- a/src/tint/lang/wgsl/reader/parser/enable_directive_test.cc
+++ b/src/tint/lang/wgsl/reader/parser/enable_directive_test.cc
@@ -205,7 +205,7 @@
     // Error when unknown extension found
     EXPECT_TRUE(p->has_error());
     EXPECT_EQ(p->error(), R"(1:8: expected extension
-Possible values: 'chromium_disable_uniformity_analysis', 'chromium_experimental_framebuffer_fetch', 'chromium_experimental_pixel_local', 'chromium_experimental_push_constant', 'chromium_experimental_subgroups', 'chromium_internal_dual_source_blending', 'chromium_internal_graphite', 'chromium_internal_relaxed_uniform_layout', 'f16')");
+Possible values: 'chromium_disable_uniformity_analysis', 'chromium_experimental_framebuffer_fetch', 'chromium_experimental_pixel_local', 'chromium_experimental_push_constant', 'chromium_experimental_subgroups', 'chromium_internal_dual_source_blending', 'chromium_internal_graphite', 'chromium_internal_input_attachments', 'chromium_internal_relaxed_uniform_layout', 'f16')");
     auto program = p->program();
     auto& ast = program.AST();
     EXPECT_EQ(ast.Enables().Length(), 0u);
diff --git a/src/tint/lang/wgsl/wgsl.def b/src/tint/lang/wgsl/wgsl.def
index acf3735..a16ae7f 100644
--- a/src/tint/lang/wgsl/wgsl.def
+++ b/src/tint/lang/wgsl/wgsl.def
@@ -78,6 +78,9 @@
   chromium_experimental_subgroups
   // A Chromium-specific extension that enables features for graphite
   chromium_internal_graphite
+  // A Chromium-specific extension that enables features for input
+  // attachments
+  chromium_internal_input_attachments
   // A Chromium-specific extension that relaxes memory layout requirements for uniform storage.
   chromium_internal_relaxed_uniform_layout
   // A Chromium-specific extension that enables dual source blending.