CC Animations: Add Platform::current()->compositorSupport() for CompositorWorkerThreadTest

third_party/WebKit/Source/platform/testing/TestingPlatformSupport.h

Index: third_party/WebKit/Source/platform/testing/TestingPlatformSupport.h
diff --git a/third_party/WebKit/Source/platform/testing/TestingPlatformSupport.h b/third_party/WebKit/Source/platform/testing/TestingPlatformSupport.h
index e028e33fbae61da58cc9efa58684bf2370adb095..7759157c2ac7b68057fcf69a589b407201cc9fe7 100644
--- a/third_party/WebKit/Source/platform/testing/TestingPlatformSupport.h
+++ b/third_party/WebKit/Source/platform/testing/TestingPlatformSupport.h
@@ -33,6 +33,7 @@
 
 #include "platform/PlatformExport.h"
 #include "public/platform/Platform.h"
+#include "public/platform/WebCompositorSupport.h"
 #include "public/platform/WebDiscardableMemory.h"
 #include "wtf/Vector.h"
 
@@ -57,6 +58,9 @@ private:
     bool m_isLocked;
 };
 
+class TestingCompositorSupport : public WebCompositorSupport {
+};
+
 class TestingPlatformSupport : public Platform {
 public:
     struct Config {