Implement specialized IC code stubs for pixel array stores.

src/stub-cache.h

Index: src/stub-cache.h
diff --git a/src/stub-cache.h b/src/stub-cache.h
index 307939dd6f44034c311bf8add7c01fd98772ea32..4638da2ad72da5c2702647384871415bf1aa35fb 100644
--- a/src/stub-cache.h
+++ b/src/stub-cache.h
@@ -176,6 +176,9 @@ class StubCache : public AllStatic {
   MUST_USE_RESULT static MaybeObject* ComputeKeyedStoreSpecialized(
       JSObject* receiver);
 
+  MUST_USE_RESULT static MaybeObject* ComputeKeyedStorePixelArray(
+      JSObject* receiver);
+
   MUST_USE_RESULT static MaybeObject* ComputeKeyedLoadOrStoreExternalArray(
       JSObject* receiver,
       bool is_store);
@@ -659,6 +662,8 @@ class KeyedStoreStubCompiler: public StubCompiler {
 
   MUST_USE_RESULT MaybeObject* CompileStoreSpecialized(JSObject* receiver);
 
+  MUST_USE_RESULT MaybeObject* CompileStorePixelArray(JSObject* receiver);
+
  private:
   MaybeObject* GetCode(PropertyType type, String* name);
 };