Fixes for re-enabling more MSVC level 4 warnings: ppapi/ edition

ppapi/proxy/ppapi_command_buffer_proxy.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 "ppapi/proxy/ppapi_command_buffer_proxy.h"
 
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/proxy_channel.h"
 #include "ppapi/shared_impl/api_id.h"
 #include "ppapi/shared_impl/host_resource.h"
@@ skipping 39 matching lines @@
   // deferred until after the synchronous flush completes, it will overwrite the
   // cached last_state_ with out-of-date data.
   message->set_unblock(true);
   Send(message);
 }
 
 void PpapiCommandBufferProxy::WaitForTokenInRange(int32 start, int32 end) {
   if (last_state_.error != gpu::error::kNoError)
     return;
 
-  bool success;
+  bool success = false;
   gpu::CommandBuffer::State state;
   if (Send(new PpapiHostMsg_PPBGraphics3D_WaitForTokenInRange(
           ppapi::API_ID_PPB_GRAPHICS_3D,
           resource_,
           start,
           end,
           &state,
           &success)))
     UpdateState(state, success);
 }
 
 void PpapiCommandBufferProxy::WaitForGetOffsetInRange(int32 start, int32 end) {
   if (last_state_.error != gpu::error::kNoError)
     return;
 
-  bool success;
+  bool success = false;
   gpu::CommandBuffer::State state;
   if (Send(new PpapiHostMsg_PPBGraphics3D_WaitForGetOffsetInRange(
           ppapi::API_ID_PPB_GRAPHICS_3D,
           resource_,
           start,
           end,
           &state,
           &success)))
     UpdateState(state, success);
 }
@@ skipping 135 matching lines @@
       last_state_ = state;
     }
   } else {
     last_state_.error = gpu::error::kLostContext;
     ++last_state_.generation;
   }
 }
 
 }  // namespace proxy
 }  // namespace ppapi