Update from https://crrev.com/306655

cc/resources/raster_source.h

 // 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.
 
 #ifndef CC_RESOURCES_RASTER_SOURCE_H_
 #define CC_RESOURCES_RASTER_SOURCE_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "cc/base/cc_export.h"
 #include "cc/debug/traced_value.h"
 #include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkColor.h"
 
 class SkCanvas;
 class SkPicture;
 
 namespace cc {
 
+class Picture;
+
 class CC_EXPORT RasterSource : public base::RefCountedThreadSafe<RasterSource> {
  public:
   struct CC_EXPORT SolidColorAnalysis {
     SolidColorAnalysis()
         : is_solid_color(false), solid_color(SK_ColorTRANSPARENT) {}
     ~SolidColorAnalysis() {}
 
     bool is_solid_color;
     SkColor solid_color;
   };
@@ skipping 54 matching lines @@
   virtual void SetRequiresClear(bool requires_clear) = 0;
 
   // Return true iff this raster source would benefit from using distance
   // field text.
   virtual bool ShouldAttemptToUseDistanceFieldText() const = 0;
 
   // Tracing functionality.
   virtual void DidBeginTracing() = 0;
   virtual void AsValueInto(base::debug::TracedValue* array) const = 0;
   virtual skia::RefPtr<SkPicture> GetFlattenedPicture() = 0;
+  virtual size_t GetPictureMemoryUsage() const = 0;
 
   // Return true if LCD anti-aliasing may be used when rastering text.
   virtual bool CanUseLCDText() const = 0;
 
  protected:
   friend class base::RefCountedThreadSafe<RasterSource>;
 
   RasterSource() {}
   virtual ~RasterSource() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RasterSource);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RASTER_SOURCE_H_