Use kRenderClientId command line flag when starting a render process

content/common/view_messages.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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 582 matching lines @@
 #endif
 
 // Sent by browser to tell renderer compositor that some resources that were
 // given to the browser in a swap are not being used anymore.
 // If this message is in response to a swap then is_swap_ack is set.
 IPC_MESSAGE_ROUTED3(ViewMsg_ReclaimCompositorResources,
                     uint32_t /* compositor_frame_sink_id */,
                     bool /* is_swap_ack */,
                     cc::ReturnedResourceArray /* resources */)
 
-// Sent by browser to give renderer compositor a new namespace ID for any
-// SurfaceSequences it has to create.
-IPC_MESSAGE_ROUTED1(ViewMsg_SetFrameSinkId, cc::FrameSinkId /* frame_sink_id */)
-
 IPC_MESSAGE_ROUTED0(ViewMsg_SelectWordAroundCaret)
 
 // Sent by the browser to ask the renderer to redraw. Robust to events that can
 // happen in renderer (abortion of the commit or draw, loss of output surface
 // etc.).
 IPC_MESSAGE_ROUTED1(ViewMsg_ForceRedraw,
                     ui::LatencyInfo /* latency_info */)
 
 // Let renderer know begin frame messages won't be sent even if requested.
 IPC_MESSAGE_ROUTED1(ViewMsg_SetBeginFramePaused, bool /* paused */)
@@ skipping 328 matching lines @@
                     int /* y */)
 
 #elif defined(OS_MACOSX)
 // Receives content of a web page as plain text.
 IPC_MESSAGE_ROUTED1(ViewMsg_GetRenderedTextCompleted, std::string)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent ViewMsg, then ifdefs for platform specific ViewMsg, then platform
 // independent ViewHostMsg, then ifdefs for platform specific ViewHostMsg.