Submit CompositorFrame from worker

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 1d62bf46088754aaa1d7afd728e2f571bcf2cf46..ed310c146db6bf4be137a786f85e66a59b2183b5 100644
--- a/third_party/WebKit/Source/core/offscreencanvas/OffscreenCanvas.cpp
+++ b/third_party/WebKit/Source/core/offscreencanvas/OffscreenCanvas.cpp
@@ -144,8 +144,12 @@ bool OffscreenCanvas::isPaintable() const
 
 OffscreenCanvasFrameDispatcher* OffscreenCanvas::getOrCreateFrameDispatcher()
 {
-    if (!m_frameDispatcher)
+    if (!m_frameDispatcher) {
+        // The frame dispatcher connects the current thread of OffscreenCanvas
+        // (either main or worker) to browser process and remains unchanged

[Justin Novosad, 2016/09/07 21:40:15]

*the* browser process

[xlai (Olivia), 2016/09/08 15:27:15]

Done.

+        // throughout the lifetime of this OffscreenCanvas.
         m_frameDispatcher = wrapUnique(new OffscreenCanvasFrameDispatcherImpl(m_clientId, m_localId, m_nonce, width(), height()));
+    }
     return m_frameDispatcher.get();
 }