Implement tex{Sub}Image{2|3}D with ArrayBufferView sub source.

third_party/WebKit/Source/core/dom/DOMArrayBufferView.h

Index: third_party/WebKit/Source/core/dom/DOMArrayBufferView.h
diff --git a/third_party/WebKit/Source/core/dom/DOMArrayBufferView.h b/third_party/WebKit/Source/core/dom/DOMArrayBufferView.h
index 8f38d2ad9ae435e8bfbeb662bf0b58a41b3f783e..6fbe12be7b01160db407c89aab4501187b99af2c 100644
--- a/third_party/WebKit/Source/core/dom/DOMArrayBufferView.h
+++ b/third_party/WebKit/Source/core/dom/DOMArrayBufferView.h
@@ -64,6 +64,7 @@ public:
     void* baseAddress() const { return view()->baseAddress(); }
     unsigned byteOffset() const { return view()->byteOffset(); }
     unsigned byteLength() const { return view()->byteLength(); }
+    unsigned typeSize() const { return view()->typeSize(); }
     void setNeuterable(bool flag) { return view()->setNeuterable(flag); }
     bool isShared() const { return view()->isShared(); }