Update from https://crrev.com/306655

cc/resources/clip_display_item.cc

Index: cc/resources/clip_display_item.cc
diff --git a/cc/resources/clip_display_item.cc b/cc/resources/clip_display_item.cc
new file mode 100644
index 0000000000000000000000000000000000000000..731c6059122df0930ce340ad894ad464a5242175
--- /dev/null
+++ b/cc/resources/clip_display_item.cc
@@ -0,0 +1,74 @@
+// 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/resources/clip_display_item.h"
+
+#include "third_party/skia/include/core/SkCanvas.h"
+
+namespace cc {
+
+ClipDisplayItem::ClipDisplayItem(gfx::Rect clip_rect,
+                                 const std::vector<SkRRect>& rounded_clip_rects)
+    : clip_rect_(clip_rect), rounded_clip_rects_(rounded_clip_rects) {
+}
+
+ClipDisplayItem::~ClipDisplayItem() {
+}
+
+void ClipDisplayItem::Raster(SkCanvas* canvas,
+                             SkDrawPictureCallback* callback) const {
+  canvas->save();
+  canvas->clipRect(SkRect::MakeXYWH(clip_rect_.x(), clip_rect_.y(),
+                                    clip_rect_.width(), clip_rect_.height()));
+  for (size_t i = 0; i < rounded_clip_rects_.size(); ++i) {
+    if (rounded_clip_rects_[i].isRect()) {
+      canvas->clipRect(rounded_clip_rects_[i].rect());
+    } else {
+      bool antialiased = true;
+      canvas->clipRRect(rounded_clip_rects_[i], SkRegion::kIntersect_Op,
+                        antialiased);
+    }
+  }
+}
+
+bool ClipDisplayItem::IsSuitableForGpuRasterization() const {
+  return true;
+}
+
+int ClipDisplayItem::ApproximateOpCount() const {
+  return 1;
+}
+
+size_t ClipDisplayItem::PictureMemoryUsage() const {
+  size_t total_size = sizeof(gfx::Rect);
+  for (size_t i = 0; i < rounded_clip_rects_.size(); ++i) {
+    total_size += sizeof(rounded_clip_rects_[i]);
+  }
+  return total_size;
+}
+
+EndClipDisplayItem::EndClipDisplayItem() {
+}
+
+EndClipDisplayItem::~EndClipDisplayItem() {
+}
+
+void EndClipDisplayItem::Raster(SkCanvas* canvas,
+                                SkDrawPictureCallback* callback) const {
+  canvas->restore();
+}
+
+bool EndClipDisplayItem::IsSuitableForGpuRasterization() const {
+  return true;
+}
+
+int EndClipDisplayItem::ApproximateOpCount() const {
+  return 0;
+}
+
+size_t EndClipDisplayItem::PictureMemoryUsage() const {
+  return 0;
+}
+
+}  // namespace cc