use SkClipOps where we can, legacyClip where we need to rework

cc/resources/display_list_raster_source.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/resources/display_list_raster_source.h"
 
 #include "base/debug/trace_event.h"
 #include "cc/base/region.h"
 #include "cc/debug/debug_colors.h"
 #include "cc/resources/display_item_list.h"
@@ skipping 81 matching lines @@
 void DisplayListRasterSource::RasterCommon(SkCanvas* canvas,
                                            SkDrawPictureCallback* callback,
                                            const gfx::Rect& canvas_rect,
                                            float contents_scale,
                                            bool is_analysis) const {
   canvas->translate(-canvas_rect.x(), -canvas_rect.y());
   gfx::Rect content_rect =
       gfx::ToEnclosingRect(gfx::ScaleRect(gfx::Rect(size_), contents_scale));
   content_rect.Intersect(canvas_rect);
 
-  canvas->clipRect(gfx::RectToSkRect(content_rect), SkRegion::kIntersect_Op);
+  canvas->clipRect(gfx::RectToSkRect(content_rect));
 
   DCHECK(display_list_.get());
   display_list_->Raster(canvas, callback, contents_scale);
 }
 
 skia::RefPtr<SkPicture> DisplayListRasterSource::GetFlattenedPicture() {
   TRACE_EVENT0("cc", "DisplayListRasterSource::GetFlattenedPicture");
 
   gfx::Rect display_list_rect(size_);
   SkPictureRecorder recorder;
@@ skipping 86 matching lines @@
 void DisplayListRasterSource::DidBeginTracing() {
   if (display_list_.get())
     display_list_->EmitTraceSnapshot();
 }
 
 bool DisplayListRasterSource::CanUseLCDText() const {
   return can_use_lcd_text_;
 }
 
 }  // namespace cc