Display tcmalloc debug output from renderer processes in about:tcmalloc.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/255080

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@28384 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 19 insertions, 0 deletions

diff --git a/chrome/renderer/render_thread.cc b/chrome/renderer/render_thread.cc
index 09b043a..241ce45 100644
--- a/chrome/renderer/render_thread.cc
+++ b/chrome/renderer/render_thread.cc
@@ -12,6 +12,7 @@
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/nullable_string16.h"
+#include "base/process_util.h"
 #include "base/shared_memory.h"
 #include "base/stats_table.h"
 #include "base/string_util.h"
@@ -277,6 +278,10 @@ void RenderThread::OnControlMessageReceived(const IPC::Message& msg) {
     IPC_MESSAGE_HANDLER(ViewMsg_SetCacheCapacities, OnSetCacheCapacities)
     IPC_MESSAGE_HANDLER(ViewMsg_GetRendererHistograms,
                         OnGetRendererHistograms)
+#if defined(USE_TCMALLOC)
+    IPC_MESSAGE_HANDLER(ViewMsg_GetRendererTcmalloc,
+                        OnGetRendererTcmalloc)
+#endif
     IPC_MESSAGE_HANDLER(ViewMsg_GetCacheResourceStats,
                         OnGetCacheResourceStats)
     IPC_MESSAGE_HANDLER(ViewMsg_UserScripts_UpdatedScripts,
@@ -363,6 +368,17 @@ void RenderThread::OnGetRendererHistograms(int sequence_number) {
   SendHistograms(sequence_number);
 }
 
+#if defined(USE_TCMALLOC)
+void RenderThread::OnGetRendererTcmalloc() {
+  std::string result;
+  char buffer[1024 * 32];
+  int pid = base::GetCurrentProcId();
+  MallocExtension::instance()->GetStats(buffer, sizeof(buffer));
+  result.append(buffer);
+  Send(new ViewHostMsg_RendererTcmalloc(pid, result));
+}
+#endif
+
 void RenderThread::InformHostOfCacheStats() {
   EnsureWebKitInitialized();
   WebCache::UsageStats stats;
diff --git a/chrome/renderer/render_thread.h b/chrome/renderer/render_thread.h
index 89f2c05..5f14260 100644
--- a/chrome/renderer/render_thread.h
+++ b/chrome/renderer/render_thread.h
@@ -172,6 +172,9 @@ class RenderThread : public RenderThreadBase,
   // Send all histograms to browser.
   void OnGetRendererHistograms(int sequence_number);
 
+  // Send tcmalloc info to browser.
+  void OnGetRendererTcmalloc();
+
   void OnExtensionMessageInvoke(const std::string& function_name,
                                 const ListValue& args);
   void OnPurgePluginListCache(bool reload_pages);