cc: Remove the capability to give up and leave compositing mode.

The request to create a fallback OutputSurface should always succeed
and there's no way to leave compositing mode. So remove this capability
from cc and instead just LOG(FATAL) if the fallback OutputSurface
ends up being NULL.

The only case where the fallback OutputSurface isn't created is in the
ChromeOS browser compositor, and in this case the
GpuProcessTransportFactory will LOG(FATAL) before cc even finds out,
so this new LOG(FATAL) should never be hit in practice, but documents
our expectations.

This removes the call to WebWidget::didExitCompositingMode.

R=enne
BUG=366130,266666

Review URL: https://codereview.chromium.org/256573003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266089 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 4 insertions, 4 deletions

diff --git a/cc/test/fake_layer_tree_host_client.h b/cc/test/fake_layer_tree_host_client.h
index 1b0ec1f..f928453 100644
--- a/cc/test/fake_layer_tree_host_client.h
+++ b/cc/test/fake_layer_tree_host_client.h
@@ -35,7 +35,7 @@ class FakeLayerTreeHostClient : public LayerTreeHostClient,
                                    float page_scale) OVERRIDE {}
 
   virtual scoped_ptr<OutputSurface> CreateOutputSurface(bool fallback) OVERRIDE;
-  virtual void DidInitializeOutputSurface(bool success) OVERRIDE {}
+  virtual void DidInitializeOutputSurface() OVERRIDE {}
   virtual void WillCommit() OVERRIDE {}
   virtual void DidCommit() OVERRIDE {}
   virtual void DidCommitAndDrawFrame() OVERRIDE {}
diff --git a/cc/test/layer_tree_test.cc b/cc/test/layer_tree_test.cc
index f67ee7c..23b5276 100644
--- a/cc/test/layer_tree_test.cc
+++ b/cc/test/layer_tree_test.cc
@@ -240,8 +240,8 @@ class LayerTreeHostClientForTesting : public LayerTreeHostClient,
     return test_hooks_->CreateOutputSurface(fallback);
   }
 
-  virtual void DidInitializeOutputSurface(bool succeeded) OVERRIDE {
-    test_hooks_->DidInitializeOutputSurface(succeeded);
+  virtual void DidInitializeOutputSurface() OVERRIDE {
+    test_hooks_->DidInitializeOutputSurface();
   }
 
   virtual void DidFailToInitializeOutputSurface() OVERRIDE {
diff --git a/cc/test/layer_tree_test.h b/cc/test/layer_tree_test.h
index 42ef53f..a4a32d2 100644
--- a/cc/test/layer_tree_test.h
+++ b/cc/test/layer_tree_test.h
@@ -64,7 +64,7 @@ class TestHooks : public AnimationDelegate {
   virtual void WillBeginMainFrame() {}
   virtual void DidBeginMainFrame() {}
   virtual void Layout() {}
-  virtual void DidInitializeOutputSurface(bool succeeded) {}
+  virtual void DidInitializeOutputSurface() {}
   virtual void DidFailToInitializeOutputSurface() {}
   virtual void DidAddAnimation() {}
   virtual void WillCommit() {}