[mojo] Get rid of Skia type converters

ui/gfx/ipc/gfx_param_traits.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 UI_GFX_IPC_GFX_PARAM_TRAITS_H_
 #define UI_GFX_IPC_GFX_PARAM_TRAITS_H_
 
 #include <string>
 
 #include "ipc/ipc_message_utils.h"
@@ skipping 92 matching lines @@
 struct GFX_IPC_EXPORT ParamTraits<gfx::RectF> {
   typedef gfx::RectF param_type;
   static void Write(Message* m, const param_type& p);
   static bool Read(const Message* m, base::PickleIterator* iter, param_type* r);
   static void Log(const param_type& p, std::string* l);
 };
 
 template <>
 struct GFX_IPC_EXPORT ParamTraits<SkBitmap> {
   typedef SkBitmap param_type;
-  static void Write(Message* m, const param_type& p);
+  static size_t GetSize(const param_type& p);
+  static void Write(base::Pickle* m, const param_type& p);
 
   // Note: This function expects parameter |r| to be of type &SkBitmap since
   // r->SetConfig() and r->SetPixels() are called.
-  static bool Read(const Message* m, base::PickleIterator* iter, param_type* r);
+  static bool Read(const base::Pickle* m,
+                   base::PickleIterator* iter,
+                   param_type* r);
 
   static void Log(const param_type& p, std::string* l);
 };
 
 template <>
 struct GFX_IPC_EXPORT ParamTraits<gfx::Range> {
   typedef gfx::Range param_type;
   static void Write(Message* m, const param_type& p);
   static bool Read(const Message* m, base::PickleIterator* iter, param_type* r);
   static void Log(const param_type& p, std::string* l);
@@ skipping 17 matching lines @@
   // called once for a given message, otherwise the singular right will be
   // managed and released by two objects.
   static bool Read(const Message* m, base::PickleIterator* iter, param_type* r);
   static void Log(const param_type& p, std::string* l);
 };
 #endif  // defined(OS_MACOSX) && !defined(OS_IOS)
 
 }  // namespace IPC
 
 #endif  // UI_GFX_IPC_GFX_PARAM_TRAITS_H_