4 files changed, 17 insertions, 17 deletions
diff --git a/chrome/renderer/render_thread.cc b/chrome/renderer/render_thread.cc
index eae0c55..0412b94 100644
--- a/chrome/renderer/render_thread.cc
+++ b/chrome/renderer/render_thread.cc
@@ -95,8 +95,8 @@ void RenderThread::Resolve(const char* name, size_t length) {
   return dns_master_->Resolve(name, length);
 }
 
-void RenderThread::SendHistograms() {
-  return histogram_snapshots_->SendHistograms();
+void RenderThread::SendHistograms(int sequence_number) {
+  return histogram_snapshots_->SendHistograms(sequence_number);
 }
 
 static WebAppCacheContext* CreateAppCacheContextForRenderer() {
@@ -212,7 +212,7 @@ void RenderThread::OnControlMessageReceived(const IPC::Message& msg) {
     IPC_MESSAGE_HANDLER(ViewMsg_New, OnCreateNewView)
     IPC_MESSAGE_HANDLER(ViewMsg_SetCacheCapacities, OnSetCacheCapacities)
     IPC_MESSAGE_HANDLER(ViewMsg_GetRendererHistograms,
-                          OnGetRendererHistograms)
+                        OnGetRendererHistograms)
     IPC_MESSAGE_HANDLER(ViewMsg_GetCacheResourceStats,
                         OnGetCacheResourceStats)
     IPC_MESSAGE_HANDLER(ViewMsg_UserScripts_UpdatedScripts,
@@ -274,8 +274,8 @@ void RenderThread::OnGetCacheResourceStats() {
   Send(new ViewHostMsg_ResourceTypeStats(stats));
 }
 
-void RenderThread::OnGetRendererHistograms() {
-  SendHistograms();
+void RenderThread::OnGetRendererHistograms(int sequence_number) {
+  SendHistograms(sequence_number);
 }
 
 void RenderThread::InformHostOfCacheStats() {
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);
diff --git a/chrome/renderer/renderer_histogram_snapshots.cc b/chrome/renderer/renderer_histogram_snapshots.cc
index 6d0507d..025eb73 100644
--- a/chrome/renderer/renderer_histogram_snapshots.cc
+++ b/chrome/renderer/renderer_histogram_snapshots.cc
@@ -22,13 +22,13 @@ RendererHistogramSnapshots::RendererHistogramSnapshots()
 }
 
 // Send data quickly!
-void RendererHistogramSnapshots::SendHistograms() {
+void RendererHistogramSnapshots::SendHistograms(int sequence_number) {
   RenderThread::current()->message_loop()->PostTask(FROM_HERE,
       renderer_histogram_snapshots_factory_.NewRunnableMethod(
-          &RendererHistogramSnapshots::UploadAllHistrograms));
+          &RendererHistogramSnapshots::UploadAllHistrograms, sequence_number));
 }
 
-void RendererHistogramSnapshots::UploadAllHistrograms() {
+void RendererHistogramSnapshots::UploadAllHistrograms(int sequence_number) {
   StatisticsRecorder::Histograms histograms;
   StatisticsRecorder::GetHistograms(&histograms);
 
@@ -39,11 +39,11 @@ void RendererHistogramSnapshots::UploadAllHistrograms() {
        it++) {
     UploadHistrogram(**it, &pickled_histograms);
   }
-  // Send the handle over synchronous IPC.
-  if (pickled_histograms.size() > 0) {
-    RenderThread::current()->Send(
-        new ViewHostMsg_RendererHistograms(pickled_histograms));
-  }
+  // Send the sequence number and list of pickled histograms over synchronous
+  // IPC.
+  RenderThread::current()->Send(
+      new ViewHostMsg_RendererHistograms(
+          sequence_number, pickled_histograms));
 }
 
 // Extract snapshot data and then send it off the the Browser process
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,