Compositing Layer update for OffscreenCanvas resize

third_party/WebKit/Source/core/offscreencanvas/OffscreenCanvas.cpp

Index: third_party/WebKit/Source/core/offscreencanvas/OffscreenCanvas.cpp
diff --git a/third_party/WebKit/Source/core/offscreencanvas/OffscreenCanvas.cpp b/third_party/WebKit/Source/core/offscreencanvas/OffscreenCanvas.cpp
index 550ae97f7812703f3bfd86bc1fb93d68371313ce..9677abbd610d402ec29af3c4c2b47377664d46b9 100644
--- a/third_party/WebKit/Source/core/offscreencanvas/OffscreenCanvas.cpp
+++ b/third_party/WebKit/Source/core/offscreencanvas/OffscreenCanvas.cpp
@@ -42,6 +42,8 @@ void OffscreenCanvas::setHeight(unsigned height) {
 }
 
 void OffscreenCanvas::setSize(const IntSize& size) {
+  if (size == m_size)
+    return;
   if (m_context) {
     if (m_context->is3d()) {
       if (size != m_size)
@@ -51,6 +53,9 @@ void OffscreenCanvas::setSize(const IntSize& size) {
     }
   }
   m_size = size;
+  if (m_frameDispatcher) {
+    m_frameDispatcher->reshape(width(), height());
+  }
 }
 
 void OffscreenCanvas::setNeutered() {