Mac Overlays: Allow SolidColor and Tile quads to be candidates for overlays.

cc/output/gl_renderer_unittest.cc

Index: cc/output/gl_renderer_unittest.cc
diff --git a/cc/output/gl_renderer_unittest.cc b/cc/output/gl_renderer_unittest.cc
index 7e35ad4e84731b3e6a5158c31d42964644dd7897..b372709a9532340929d2e6e1f97b66972b042e2b 100644
--- a/cc/output/gl_renderer_unittest.cc
+++ b/cc/output/gl_renderer_unittest.cc
@@ -2122,6 +2122,8 @@ class SingleOverlayOnTopProcessor : public OverlayProcessor {
       strategies->push_back(make_scoped_ptr(new OverlayStrategyUnderlay(this)));
     }
 
+    bool IsSupportedQuad(const DrawQuad* quad) override { return true; }
+
     void CheckOverlaySupport(OverlayCandidateList* surfaces) override {
       ASSERT_EQ(1U, surfaces->size());
       OverlayCandidate& candidate = surfaces->back();