Add use counters for lots of DOM APIs.

third_party/WebKit/Source/core/html/HTMLCanvasElement.idl

Index: third_party/WebKit/Source/core/html/HTMLCanvasElement.idl
diff --git a/third_party/WebKit/Source/core/html/HTMLCanvasElement.idl b/third_party/WebKit/Source/core/html/HTMLCanvasElement.idl
index f2aa7983cc2b4642a326da23e8f81382a0a3666c..f5fb44d57dc30c10518be6b3cfe3dd53b878ae8c 100644
--- a/third_party/WebKit/Source/core/html/HTMLCanvasElement.idl
+++ b/third_party/WebKit/Source/core/html/HTMLCanvasElement.idl
@@ -32,13 +32,13 @@ interface HTMLCanvasElement : HTMLElement
     // interface in HTMLCanvasElementModule.idl
 
     // FIXME: width and height should be unsigned long.
-    [RaisesException=Setter, CEReactions] attribute long width;
-    [RaisesException=Setter, CEReactions] attribute long height;
+  [Measure, RaisesException=Setter, CEReactions] attribute long width;
+  [Measure, RaisesException=Setter, CEReactions] attribute long height;
 
     // Note: The arguments argument is variadic in the spec, but not here as
     // only one extra argument is actually used.
     // FIXME: type should not have a default value.
     [RaisesException] DOMString toDataURL(optional DOMString type = null, optional any arguments);
 
-    [RaisesException] void toBlob(BlobCallback _callback, optional DOMString type = null, optional any arguments);
+  [Measure, RaisesException] void toBlob(BlobCallback _callback, optional DOMString type = null, optional any arguments);
 };