cc: draw_and_swap_full_viewport_every_frame OS cap

This OutputSurface Capability is used if the compositor need to
guarantee that each BeginFrame leads to a draw and swap, even if
the resulting frame may not be ideal.

Conditions that used to avoid drawing include:
Invalid viewport
Recently purged textures
Impl animation

The case of having no active root layer is not covered yet.

BUG=261809, 250909
R=danakj@chromium.org, enne@chromium.org, jamesr@chromium.org, joth@chromium.org

Review URL: https://codereview.chromium.org/19779003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@214403 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 7 insertions, 0 deletions

diff --git a/cc/test/fake_output_surface.h b/cc/test/fake_output_surface.h
index 18759ec..dfd4db5 100644
--- a/cc/test/fake_output_surface.h
+++ b/cc/test/fake_output_surface.h
@@ -56,6 +56,7 @@ class FakeOutputSurface : public OutputSurface {
         new FakeOutputSurface(software_device.Pass(), true));
   }
 
+  // TODO(boliu): Use a general factory that takes Capabilities arg.
   static scoped_ptr<FakeOutputSurface> CreateDeferredGL(
       scoped_ptr<SoftwareOutputDevice> software_device) {
     scoped_ptr<FakeOutputSurface> result(
@@ -64,6 +65,12 @@ class FakeOutputSurface : public OutputSurface {
     return result.Pass();
   }
 
+  static scoped_ptr<FakeOutputSurface> CreateAlwaysDrawAndSwap3d() {
+    scoped_ptr<FakeOutputSurface> result(Create3d());
+    result->capabilities_.draw_and_swap_full_viewport_every_frame = true;
+    return result.Pass();
+  }
+
   CompositorFrame& last_sent_frame() { return last_sent_frame_; }
   size_t num_sent_frames() { return num_sent_frames_; }