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/renderer_histogram_snapshots.h b/chrome/renderer/renderer_histogram_snapshots.h
index 5c9f93a..0a1238c 100644
--- a/chrome/renderer/renderer_histogram_snapshots.h
+++ b/chrome/renderer/renderer_histogram_snapshots.h
@@ -24,7 +24,7 @@ class RendererHistogramSnapshots {
   ~RendererHistogramSnapshots() {}
 
   // Send the histogram data.
-  void SendHistograms();
+  void SendHistograms(int sequence_number);
 
   // Maintain a map of histogram names to the sample stats we've sent.
   typedef std::map<std::string, Histogram::SampleSet> LoggedSampleMap;
@@ -33,7 +33,7 @@ class RendererHistogramSnapshots {
  private:
   // Extract snapshot data and then send it off the the Browser process.
   // Send only a delta to what we have already sent.
-  void UploadAllHistrograms();
+  void UploadAllHistrograms(int sequence_number);
   void UploadHistrogram(const Histogram& histogram,
                         HistogramPickledList* histograms);
   void UploadHistogramDelta(const Histogram& histogram,