Create specialized code stubs for PixelArray loads.

src/stub-cache.h

Index: src/stub-cache.h
diff --git a/src/stub-cache.h b/src/stub-cache.h
index 07f894a512fe2e8ea3e08d497bcb8de76ac9f68e..6d782798335eddf73fbd7ed22f28462469f8d6f9 100644
--- a/src/stub-cache.h
+++ b/src/stub-cache.h
@@ -133,6 +133,9 @@ class StubCache : public AllStatic {
   MUST_USE_RESULT static MaybeObject* ComputeKeyedLoadSpecialized(
       JSObject* receiver);
 
+  MUST_USE_RESULT static MaybeObject* ComputeKeyedLoadPixelArray(
+      JSObject* receiver);
+
   // ---
 
   MUST_USE_RESULT static MaybeObject* ComputeStoreField(String* name,
@@ -607,6 +610,7 @@ class KeyedLoadStubCompiler: public StubCompiler {
   MUST_USE_RESULT MaybeObject* CompileLoadFunctionPrototype(String* name);
 
   MUST_USE_RESULT MaybeObject* CompileLoadSpecialized(JSObject* receiver);
+  MUST_USE_RESULT MaybeObject* CompileLoadPixelArray(JSObject* receiver);
 
  private:
   MaybeObject* GetCode(PropertyType type, String* name);