Update from https://crrev.com/306706

skia/ext/bitmap_platform_device_mac.h

 // Copyright (c) 2012 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 SKIA_EXT_BITMAP_PLATFORM_DEVICE_MAC_H_
 #define SKIA_EXT_BITMAP_PLATFORM_DEVICE_MAC_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "skia/ext/platform_device.h"
@@ skipping 17 matching lines @@
 // DEVICE'S PIXEL DATA TO ANOTHER BITMAP, make sure you copy instead.
 class SK_API BitmapPlatformDevice : public SkBitmapDevice, public PlatformDevice {
  public:
   // Creates a BitmapPlatformDevice instance. |is_opaque| should be set if the
   // caller knows the bitmap will be completely opaque and allows some
   // optimizations.
   // |context| may be NULL. If |context| is NULL, then the bitmap backing store
   // is not initialized.
   static BitmapPlatformDevice* Create(CGContextRef context,
                                       int width, int height,
-                                      bool is_opaque);
-
-  // Creates a BitmapPlatformDevice instance.  If |is_opaque| is false,
-  // then the bitmap is initialzed to 0.
-  static BitmapPlatformDevice* CreateAndClear(int width, int height,
-                                              bool is_opaque);
+                                      bool is_opaque, bool do_clear = false);
 
   // Creates a context for |data| and calls Create.
   // If |data| is NULL, then the bitmap backing store is not initialized.
   static BitmapPlatformDevice* CreateWithData(uint8_t* data,
                                               int width, int height,
                                               bool is_opaque);
 
   ~BitmapPlatformDevice() override;
 
   // PlatformDevice overrides
@@ skipping 40 matching lines @@
   SkMatrix transform_;
 
   // The current clipping
   SkRegion clip_region_;
   DISALLOW_COPY_AND_ASSIGN(BitmapPlatformDevice);
 };
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_BITMAP_PLATFORM_DEVICE_MAC_H_