Histograms - Support histograms for Plugins, GPU

chrome/common/render_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.
 
 // Multiply-included file, no traditional include guard.
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 220 matching lines @@
                      RendererContentSettingRules /* rules */)
 
 // Tells the render view to load all blocked plugins with the given identifier.
 IPC_MESSAGE_ROUTED1(ChromeViewMsg_LoadBlockedPlugins,
                     std::string /* identifier */)
 
 // Asks the renderer to send back stats on the WebCore cache broken down by
 // resource types.
 IPC_MESSAGE_CONTROL0(ChromeViewMsg_GetCacheResourceStats)
 
-// Asks the renderer to send back Histograms.
-IPC_MESSAGE_CONTROL1(ChromeViewMsg_GetRendererHistograms,
-                     int /* sequence number of Renderer Histograms. */)
-
 // Tells the renderer to create a FieldTrial, and by using a 100% probability
 // for the FieldTrial, forces the FieldTrial to have assigned group name.
 IPC_MESSAGE_CONTROL2(ChromeViewMsg_SetFieldTrialGroup,
                      std::string /* field trial name */,
                      std::string /* group name that was assigned. */)
 
 #if defined(USE_TCMALLOC)
 // Asks the renderer to enable/disable Tcmalloc heap profiling.
 // Note: filename_prefix arg is effectively ignored since the render process
 // will be unable to write files to disk. Instead use WriteTcmallocHeapProfile
@@ skipping 370 matching lines @@
 // previous SetCookie message to be processed.
 IPC_SYNC_MESSAGE_ROUTED2_1(ChromeViewHostMsg_GetCookies,
                            GURL /* url */,
                            GURL /* first_party_for_cookies */,
                            std::string /* cookies */)
 
 // Provide the browser process with current renderer framerate.
 IPC_MESSAGE_CONTROL2(ChromeViewHostMsg_FPS,
                      int /* routing id */,
                      float /* frames per second */)