cc: Split Proxy to eliminate unnecessary dependencies on the impl side

cc/layers/video_frame_provider_client_impl_unittest.cc

Index: cc/layers/video_frame_provider_client_impl_unittest.cc
diff --git a/cc/layers/video_frame_provider_client_impl_unittest.cc b/cc/layers/video_frame_provider_client_impl_unittest.cc
index 4cbd493e0d54aa316e6c478c3ef8312489f6630e..1c0f2847278b7000ac1f87d924ff8e79f560863e 100644
--- a/cc/layers/video_frame_provider_client_impl_unittest.cc
+++ b/cc/layers/video_frame_provider_client_impl_unittest.cc
@@ -18,10 +18,11 @@ namespace cc {
 // NOTE: We cannot use DebugScopedSetImplThreadAndMainThreadBlocked in these
 // tests because it gets destroyed before the VideoLayerImpl is destroyed. This
 // causes a DCHECK in VideoLayerImpl's destructor to fail.
-static void DebugSetImplThreadAndMainThreadBlocked(Proxy* proxy) {
+static void DebugSetImplThreadAndMainThreadBlocked(
+    ThreadVerifier* thread_verifier) {
 #if DCHECK_IS_ON()
-  proxy->SetCurrentThreadIsImplThread(true);
-  proxy->SetMainThreadBlocked(true);
+  thread_verifier->SetCurrentThreadIsImplThread(true);
+  thread_verifier->SetMainThreadBlocked(true);
 #endif
 }
 
@@ -36,7 +37,7 @@ class VideoFrameProviderClientImplTest : public testing::Test,
                                                    gfx::Rect(10, 10),
                                                    gfx::Size(10, 10),
                                                    base::TimeDelta())) {
-    DebugSetImplThreadAndMainThreadBlocked(impl_.proxy());
+    DebugSetImplThreadAndMainThreadBlocked(impl_.thread_verifier());
   }
 
   ~VideoFrameProviderClientImplTest() {