Add hints for potential overlay promotion on android.

cc/output/overlay_candidate.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/output/overlay_candidate.h"
 
 #include <algorithm>
 #include <limits>
 #include "base/logging.h"
 #include "cc/base/math_util.h"
@@ skipping 155 matching lines @@
 
 }  // namespace
 
 OverlayCandidate::OverlayCandidate()
     : transform(gfx::OVERLAY_TRANSFORM_NONE),
       format(RGBA_8888),
       uv_rect(0.f, 0.f, 1.f, 1.f),
       is_clipped(false),
       use_output_surface_for_resource(false),
       resource_id(0),
+#if defined(OS_ANDROID)
+      is_backed_by_surface_texture(false),
+#endif
       plane_z_order(0),
       is_unoccluded(false),
-      overlay_handled(false) {}
+      overlay_handled(false) {
+}
 
 OverlayCandidate::OverlayCandidate(const OverlayCandidate& other) = default;
 
 OverlayCandidate::~OverlayCandidate() {}
 
 // static
 bool OverlayCandidate::FromDrawQuad(ResourceProvider* resource_provider,
                                     const DrawQuad* quad,
                                     OverlayCandidate* candidate) {
   if (quad->ShouldDrawWithBlending() ||
@@ skipping 86 matching lines @@
   if (overlay_transform == gfx::OVERLAY_TRANSFORM_INVALID)
     return false;
   if (!quad->matrix.IsScaleOrTranslation()) {
     // We cannot handle anything other than scaling & translation for texture
     // coordinates yet.
     return false;
   }
   candidate->resource_id = quad->resource_id();
   candidate->resource_size_in_pixels = quad->resource_size_in_pixels();
   candidate->transform = overlay_transform;
+#if defined(OS_ANDROID)
+  candidate->is_backed_by_surface_texture =
+      resource_provider->IsBackedBySurfaceTexture(quad->resource_id());
+#endif
 
   gfx::Point3F uv0 = gfx::Point3F(0, 0, 0);
   gfx::Point3F uv1 = gfx::Point3F(1, 1, 0);
   quad->matrix.TransformPoint(&uv0);
   quad->matrix.TransformPoint(&uv1);
   gfx::Vector3dF delta = uv1 - uv0;
   if (delta.x() < 0) {
     candidate->transform = ComposeTransforms(
         gfx::OVERLAY_TRANSFORM_FLIP_HORIZONTAL, candidate->transform);
     float x0 = uv0.x();
     uv0.set_x(uv1.x());
     uv1.set_x(x0);
     delta.set_x(-delta.x());
   }
 
   if (delta.y() < 0) {
     // In this situation, uv0y < uv1y. Since we overlay inverted, a request
     // to invert the source texture means we can just output the texture
     // normally and it will be correct.
     candidate->uv_rect = gfx::RectF(uv0.x(), uv1.y(), delta.x(), -delta.y());
   } else {
     candidate->transform = ComposeTransforms(
         gfx::OVERLAY_TRANSFORM_FLIP_VERTICAL, candidate->transform);
     candidate->uv_rect = gfx::RectF(uv0.x(), uv0.y(), delta.x(), delta.y());
   }
   return true;
 }
 
+bool OverlayCandidateValidator::IsResourcePromotable(ResourceId resource_id) {
+  return false;
+}
+
 }  // namespace cc