cc: Add OverlayStrategyFullscreen strategy.

cc/output/overlay_strategy_fullscreen.cc

+// Copyright 2016 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_strategy_fullscreen.h"
+
+#include "cc/base/math_util.h"
+#include "cc/output/overlay_candidate_validator.h"
+#include "cc/quads/draw_quad.h"
+#include "cc/quads/solid_color_draw_quad.h"
+#include "ui/gfx/geometry/rect_conversions.h"
+#include "ui/gfx/geometry/size_conversions.h"
+
+namespace cc {
+
+OverlayStrategyFullscreen::OverlayStrategyFullscreen() {}
+
+OverlayStrategyFullscreen::~OverlayStrategyFullscreen() {}
+
+bool OverlayStrategyFullscreen::Attempt(ResourceProvider* resource_provider,
+                                        RenderPass* render_pass,
+                                        OverlayCandidateList* candidate_list) {
+  QuadList* quad_list = &render_pass->quad_list;
+  // First quad of quad_list is the top most quad.
+  auto front = quad_list->begin();
+  while (front != quad_list->end()) {
+    if (!OverlayCandidate::IsInvisibleQuad(*front))
+      break;
+    front++;
+  }
+
+  if (front == quad_list->end())
+    return false;
+
+  OverlayCandidate candidate;
+  if (!OverlayCandidate::FromDrawQuad(resource_provider, *front, &candidate)) {
+    return false;
+  }
+
+  if (candidate.transform != gfx::OVERLAY_TRANSFORM_NONE) {
+    return false;
+  }
+
+  if (!candidate.display_rect.origin().IsOrigin() ||
+      gfx::ToRoundedSize(candidate.display_rect.size()) !=
+          render_pass->output_rect.size() ||
+      render_pass->output_rect.size() != candidate.resource_size_in_pixels) {
+    return false;
+  }
+
+  candidate.plane_z_order = 1;
+  candidate.overlay_handled = true;
+  candidate_list->push_back(candidate);
+  quad_list->EraseAndInvalidateAllPointers(quad_list->begin());
+  return true;
+}
+
+}  // namespace cc