compositor-worker: Refactor CompositorWorkerManager

third_party/WebKit/public/platform/Platform.h

Index: third_party/WebKit/public/platform/Platform.h
diff --git a/third_party/WebKit/public/platform/Platform.h b/third_party/WebKit/public/platform/Platform.h
index 9924046c06274895a68b8c075cf0e06005fa1ab5..589dcf5505653c52b970c1a9c5508ed480ee21b4 100644
--- a/third_party/WebKit/public/platform/Platform.h
+++ b/third_party/WebKit/public/platform/Platform.h
@@ -354,6 +354,7 @@ public:
 
     // Creates an embedder-defined thread.
     virtual WebThread* createThread(const char* name) { return nullptr; }
+    virtual WebThread* createThreadForCompositor(const char* name) { return nullptr; }
 
     // Returns an interface to the current thread. This is owned by the
     // embedder.
@@ -434,6 +435,8 @@ public:
     // Returns an interface to the main thread. Can be null if blink was initialized on a thread without a message loop.
     BLINK_PLATFORM_EXPORT WebThread* mainThread() const;
 
+    virtual WebThread* compositorThread() const { return 0; }
+
     // Vibration -----------------------------------------------------------
 
     // Starts a vibration for the given duration in milliseconds. If there is currently an active