cc: Fix nullptr dereference when capturing skps.

cc/playback/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/playback/display_list_raster_source.h"
 
 #include <stddef.h>
 
 #include "base/containers/adapters.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 369 matching lines @@
   }
 }
 
 skia::RefPtr<SkPicture> DisplayListRasterSource::GetFlattenedPicture() {
   TRACE_EVENT0("cc", "DisplayListRasterSource::GetFlattenedPicture");
 
   gfx::Rect display_list_rect(size_);
   SkPictureRecorder recorder;
   SkCanvas* canvas = recorder.beginRecording(display_list_rect.width(),
                                              display_list_rect.height());
-  if (!display_list_rect.IsEmpty())
-    PlaybackToCanvas(canvas, display_list_rect, display_list_rect, 1.0);
+  if (!display_list_rect.IsEmpty()) {
+    PrepareForPlaybackToCanvas(canvas, display_list_rect, display_list_rect,
+                               1.f);
+    RasterCommon(canvas, nullptr, display_list_rect, display_list_rect, 1.f);
+  }
   skia::RefPtr<SkPicture> picture =
       skia::AdoptRef(recorder.endRecordingAsPicture());
 
   return picture;
 }
 
 size_t DisplayListRasterSource::GetPictureMemoryUsage() const {
   if (!display_list_)
     return 0;
   return display_list_->ApproximateMemoryUsage() +
@@ skipping 91 matching lines @@
     ImageDecodeController* image_decode_controller) {
   DCHECK(image_decode_controller);
   // Note that although this function should only be called once, tests tend to
   // call it several times using the same controller.
   DCHECK(!image_decode_controller_ ||
          image_decode_controller_ == image_decode_controller);
   image_decode_controller_ = image_decode_controller;
 }
 
 }  // namespace cc