Automatically adapt to faster/slower uploads of renderer histograms

This replaces the current time based approach (chrome is given N seconds
to upload all renederer histograms) with an asynch callback approach
that waits until all renderers have responded (with their updates). It
uses a fall-back timer to ensure that a hung renderer won't delay things
forever as well.

This causes faster (and complete) updates in about:histograms as well
as generally assuring complete updates during UMA gatherings.

This code was contributed by Raman Tenneti in CL 42496
http://codereview.chromium.org/42496

bug=12850

r=raman
Review URL: http://codereview.chromium.org/113473

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17123 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 2 insertions, 2 deletions

diff --git a/chrome/renderer/render_thread.h b/chrome/renderer/render_thread.h
index 123c9dc..27312c0 100644
--- a/chrome/renderer/render_thread.h
+++ b/chrome/renderer/render_thread.h
@@ -97,7 +97,7 @@ class RenderThread : public RenderThreadBase,
   void Resolve(const char* name, size_t length);
 
   // Send all the Histogram data to browser.
-  void SendHistograms();
+  void SendHistograms(int sequence_number);
 
   // Invokes InformHostOfCacheStats after a short delay.  Used to move this
   // bookkeeping operation off the critical latency path.
@@ -125,7 +125,7 @@ class RenderThread : public RenderThreadBase,
   void OnGetCacheResourceStats();
 
   // Send all histograms to browser.
-  void OnGetRendererHistograms();
+  void OnGetRendererHistograms(int sequence_number);
 
   void OnExtensionHandleConnect(int channel_id, const std::string& tab_json);
   void OnExtensionHandleMessage(const std::string& message, int channel_id);