make the names in dawn.json consistent.

Most of names in dawn.json are in lower case, and we leave a blank space
between words. This tiny patch revises a few names, in order to conform
to the rule.

BUG=

Change-Id: I8f3f706bd48ce04fcca207a28f1b8725d7e0a7bc
Reviewed-on: https://dawn-review.googlesource.com/c/2000
Reviewed-by: Jiawei Shao <jiawei.shao@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Yunchao He <yunchao.he@intel.com>
diff --git a/dawn.json b/dawn.json
index 973cc96..07a7f7d 100644
--- a/dawn.json
+++ b/dawn.json
@@ -598,8 +598,8 @@
             {
                 "name": "set stencil mask",
                 "args": [
-                    {"name": "readMask", "type": "uint32_t"},
-                    {"name": "writeMask", "type": "uint32_t"}
+                    {"name": "read mask", "type": "uint32_t"},
+                    {"name": "write mask", "type": "uint32_t"}
                 ]
             }
         ]
@@ -993,7 +993,7 @@
                 "name": "configure",
                 "args": [
                     {"name": "format", "type": "texture format"},
-                    {"name": "allowedUsage", "type": "texture usage bit"},
+                    {"name": "allowed usage", "type": "texture usage bit"},
                     {"name": "width", "type": "uint32_t"},
                     {"name": "height", "type": "uint32_t"}
                 ]