Create and pass shared-histogram-allocator from browser to renderer.

content/browser/histogram_controller.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 "content/browser/histogram_controller.h"
 
 #include "base/bind.h"
 #include "base/metrics/histogram.h"
 #include "base/process/process_handle.h"
 #include "content/browser/histogram_subscriber.h"
@@ skipping 72 matching lines @@
     }
 
     // In some cases, there may be no child process of the given type (for
     // example, the GPU process may not exist and there may instead just be a
     // GPU thread in the browser process). If that's the case, then the process
     // handle will be base::kNullProcessHandle and we shouldn't ask it for data.
     if (data.handle == base::kNullProcessHandle)
       continue;
 
     ++pending_processes;
-    if (!iter.Send(new ChildProcessMsg_GetChildHistogramData(sequence_number)))
+    if (!iter.Send(new ChildProcessMsg_GetChildNonPersistentHistogramData(
+            sequence_number))) {
       --pending_processes;
+    }
   }
 
   BrowserThread::PostTask(
       BrowserThread::UI,
       FROM_HERE,
       base::Bind(
           &HistogramController::OnPendingProcesses,
           base::Unretained(this),
           sequence_number,
           pending_processes,
           true));
 }
 
 void HistogramController::GetHistogramData(int sequence_number) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   int pending_processes = 0;
   for (RenderProcessHost::iterator it(RenderProcessHost::AllHostsIterator());
        !it.IsAtEnd(); it.Advance()) {
     ++pending_processes;
     if (!it.GetCurrentValue()->Send(
-            new ChildProcessMsg_GetChildHistogramData(sequence_number))) {
+            new ChildProcessMsg_GetChildNonPersistentHistogramData(
+                sequence_number))) {
       --pending_processes;
     }
   }
   OnPendingProcesses(sequence_number, pending_processes, false);
 
   BrowserThread::PostTask(
       BrowserThread::IO,
       FROM_HERE,
       base::Bind(&HistogramController::GetHistogramDataFromChildProcesses,
                  base::Unretained(this),
                  sequence_number));
 }
 
 }  // namespace content