Enable RenderPassDrawQuad promotion to CALayer.

This CL enables the Core Animation compositor's implementation of CSS filter
effects.

BUG=581526
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel

Review-Url: https://codereview.chromium.org/2183333002
Cr-Commit-Position: refs/heads/master@{#408216}

cc/output/ca_layer_overlay.cc

@@ -17,8 +17,6 @@ namespace cc {
 
 namespace {
 
-bool g_allow_rpdq_quad_conversion = false;
-
 // This enum is used for histogram states and should only have new values added
 // to the end before COUNT.
 enum CALayerResult {
@@ -122,11 +120,7 @@ CALayerResult FromRenderPassQuad(ResourceProvider* resource_provider,
   ca_layer_overlay->render_pass_id = quad->render_pass_id;
   ca_layer_overlay->contents_rect = gfx::RectF(0, 0, 1, 1);
 
-  // TODO(erikchen): Enable this when RenderPassDrawQuad promotion to CALayer
-  // is fully functional. https://crbug.com/581526.
-  if (g_allow_rpdq_quad_conversion)
-    return CA_LAYER_SUCCESS;
-  return CA_LAYER_FAILED_RENDER_PASS;
+  return CA_LAYER_SUCCESS;
 }
 
 CALayerResult FromStreamVideoQuad(ResourceProvider* resource_provider,
@@ -342,8 +336,4 @@ bool ProcessForCALayerOverlays(ResourceProvider* resource_provider,
   return true;
 }
 
-void EnableRenderPassDrawQuadForTesting() {
-  g_allow_rpdq_quad_conversion = true;
-}
-
 }  // namespace cc

cc/output/ca_layer_overlay.h

@@ -79,9 +79,6 @@ bool ProcessForCALayerOverlays(ResourceProvider* resource_provider,
                                const QuadList& quad_list,
                                CALayerOverlayList* ca_layer_overlays);
 
-// Allows RenderPassDrawQuads to be converted to CALayerOverlays.
-void CC_EXPORT EnableRenderPassDrawQuadForTesting();
-
 }  // namespace cc
 
 #endif  // CC_OUTPUT_CA_LAYER_OVERLAY_H_

cc/output/overlay_unittest.cc

@@ -1756,7 +1756,6 @@ class CALayerOverlayRPDQTest : public CALayerOverlayTest {
  protected:
   void SetUp() override {
     CALayerOverlayTest::SetUp();
-    EnableRenderPassDrawQuadForTesting();
     pass_ = CreateRenderPass();
     quad_ = pass_->CreateAndAppendDrawQuad<RenderPassDrawQuad>();
     render_pass_id_.layer_id = 3;