Warn on missing OVERRIDE/virtual everywhere, not just in header files.

cc/trees/layer_tree_host_unittest.cc

Index: cc/trees/layer_tree_host_unittest.cc
diff --git a/cc/trees/layer_tree_host_unittest.cc b/cc/trees/layer_tree_host_unittest.cc
index 08c2228824e15426031c95e3a11fbe6c95ea2551..dc95390a811d3c9bfa4470eb2c20b60ea48614c8 100644
--- a/cc/trees/layer_tree_host_unittest.cc
+++ b/cc/trees/layer_tree_host_unittest.cc
@@ -2362,7 +2362,7 @@ class LayerTreeHostTestUninvertibleTransformDoesNotBlockActivation
     PostSetNeedsCommitToMainThread();
   }
 
-  virtual void TreeActivatedOnThread(LayerTreeHostImpl* host_impl) {
+  virtual void TreeActivatedOnThread(LayerTreeHostImpl* host_impl) OVERRIDE {
     EndTest();
   }
 
@@ -2582,7 +2582,7 @@ class LayerTreeHostTestAsyncReadback : public LayerTreeHostTest {
     PostSetNeedsCommitToMainThread();
   }
 
-  virtual void DidCommitAndDrawFrame() {
+  virtual void DidCommitAndDrawFrame() OVERRIDE {
     int frame = layer_tree_host()->commit_number();
     switch (frame) {
       case 1:
@@ -2632,7 +2632,7 @@ class LayerTreeHostTestAsyncReadback : public LayerTreeHostTest {
     callbacks_.push_back(gfx::Size(bitmap->width(), bitmap->height()));
   }
 
-  virtual void AfterTest() {}
+  virtual void AfterTest() OVERRIDE {}
 
   virtual scoped_ptr<OutputSurface> CreateOutputSurface() OVERRIDE {
     if (use_gl_renderer_)
@@ -2691,7 +2691,7 @@ class LayerTreeHostTestAsyncReadbackLayerDestroyed : public LayerTreeHostTest {
     PostSetNeedsCommitToMainThread();
   }
 
-  virtual void DidCommit() {
+  virtual void DidCommit() OVERRIDE {
     int frame = layer_tree_host()->commit_number();
     switch (frame) {
       case 1:
@@ -2746,7 +2746,7 @@ class LayerTreeHostTestAsyncReadbackLayerDestroyed : public LayerTreeHostTest {
     ++callback_count_;
   }
 
-  virtual void AfterTest() {}
+  virtual void AfterTest() OVERRIDE {}
 
   int callback_count_;
   FakeContentLayerClient client_;