CL removing inheritance of SkDevice from PlatformDevice. Flavours of PlatformDevice classes now ...

skia/ext/platform_device.cc

 // Copyright (c) 2011 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/platform_device.h"
 
 #include "third_party/skia/include/core/SkMetaData.h"
 
 namespace skia {
 
 namespace {
+
 const char* kDevicePlatformBehaviour = "CrDevicePlatformBehaviour";
+
+void* PlatformDevicePtrProc(void* ptr, bool doRef) {
+    SkASSERT(ptr);
+    PlatformDevice* platform_device = reinterpret_cast<PlatformDevice*>(ptr);
+
+    if (!doRef) {
+        delete platform_device;
+        return NULL;
+    }
+
+    return ptr;
 }
 
-void SetPlatformDevice(SkDevice* device, PlatformDevice* platform_behaviour) {
+}
+
+void SetPlatformDevice(SkDevice* device, PlatformDevice* platform_behaviour,
+                       bool transfer_ownership) {
   SkMetaData& meta_data = device->getMetaData();
-  meta_data.setPtr(kDevicePlatformBehaviour, platform_behaviour);
+  if (transfer_ownership) {
+    meta_data.setPtr(kDevicePlatformBehaviour, platform_behaviour,
+                     PlatformDevicePtrProc);
+  } else {
+    meta_data.setPtr(kDevicePlatformBehaviour, platform_behaviour);
+  }
 }
 
 PlatformDevice* GetPlatformDevice(SkDevice* device) {
   SkMetaData& meta_data = device->getMetaData();
   PlatformDevice* device_behaviour = NULL;
   if (meta_data.findPtr(kDevicePlatformBehaviour,
                         reinterpret_cast<void**>(&device_behaviour)))
     return device_behaviour;
 
   return NULL;
 }
 
 }  // namespace skia