tint: TINT_EMIT_COVERAGE -> DAWN_EMIT_COVERAGE

Change-Id: Ic215fba55238d89f9790f071361e29fddfc3624d
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/116340
Commit-Queue: James Price <jrprice@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
diff --git a/docs/tint/coverage-info.md b/docs/tint/coverage-info.md
index fdb79df..bfdaed3 100644
--- a/docs/tint/coverage-info.md
+++ b/docs/tint/coverage-info.md
@@ -7,7 +7,7 @@
 
 ## Building Tint with coverage generation enabled
 
-Follow the steps [to build Tint with CMake](../README.md), but include the additional `-DTINT_EMIT_COVERAGE=1` CMake flag.
+Follow the steps [to build Tint with CMake](../README.md), but include the additional `-DDAWN_EMIT_COVERAGE=1` CMake flag.
 
 ## Generate coverage information
 
diff --git a/tools/tint-generate-coverage b/tools/tint-generate-coverage
index 5136a1e..284e2e9 100755
--- a/tools/tint-generate-coverage
+++ b/tools/tint-generate-coverage
@@ -57,7 +57,7 @@
 # Check that coverage information was generated
 if [ ! -f "$PROFRAW_FILE" ]; then
     echo "lcov.info was not generated. Is coverage generation enabled?"
-    echo "To enable, run cmake with -DTINT_EMIT_COVERAGE=1".
+    echo "To enable, run cmake with -DDAWN_EMIT_COVERAGE=1".
     exit 1
 fi