Implement specialized IC code stubs for pixel array stores.

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index dcd813b7743e8822b40814abe65f50a9ea912665..f50c3f9ac8573294af85fffb44213462ae807e82 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -184,6 +184,7 @@ namespace internal {
   V(KeyedLoadSpecialized_symbol, "KeyedLoadSpecialized")                 \
   V(KeyedStoreSpecialized_symbol, "KeyedStoreSpecialized")               \
   V(KeyedLoadPixelArray_symbol, "KeyedLoadPixelArray")                   \
+  V(KeyedStorePixelArray_symbol, "KeyedStorePixelArray")                 \
   V(stack_overflow_symbol, "kStackOverflowBoilerplate")                  \
   V(illegal_access_symbol, "illegal access")                             \
   V(out_of_memory_symbol, "out-of-memory")                               \