Optionally clear PlatformCanvas instances.

skia/ext/bitmap_platform_device_linux.cc

 // 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.
 
 #include "skia/ext/bitmap_platform_device_linux.h"
 
 #include "skia/ext/bitmap_platform_device_data.h"
 
 #if defined(OS_OPENBSD)
 #include <cairo.h>
@@ skipping 92 matching lines @@
   BitmapPlatformDevice* device = Create(width, height, is_opaque, surface);
 
 #ifndef NDEBUG
   if (is_opaque)  // Fill with bright bluish green
     device->eraseColor(SkColorSetARGB(255, 0, 255, 128));
 #endif
 
   return device;
 }
 
+BitmapPlatformDevice* BitmapPlatformDevice::CreateAndClear(int width,
+                                                           int height,
+                                                           bool is_opaque) {
+  // The Linux port always constructs initialized bitmaps, so there is no extra
+  // work to perform here.
+  return Create(width, height, is_opaque);
+}
+
 BitmapPlatformDevice* BitmapPlatformDevice::Create(int width, int height,
                                                    bool is_opaque,
                                                    uint8_t* data) {
   cairo_surface_t* surface = cairo_image_surface_create_for_data(
       data, CAIRO_FORMAT_ARGB32, width, height,
       cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, width));
 
   return Create(width, height, is_opaque, surface);
 }
 
@@ skipping 35 matching lines @@
   SkASSERT(false);
 }
 
 void BitmapPlatformDevice::setMatrixClip(const SkMatrix& transform,
                                          const SkRegion& region,
                                          const SkClipStack&) {
   data_->SetMatrixClip(transform, region);
 }
 
 }  // namespace skia