Improve reporting of subprocess crashes.

-Split extension renderer crashes out of the existing UMA renderer crash metric 
into its own metric.

-Add a new metric for the sum of all ChildProcessHost crashes.

-Add histograms for each crash type.


BUG=28022
TEST=We should start getting more crash reports in UMA and histograms.

Review URL: http://codereview.chromium.org/468005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@33794 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 10 insertions, 0 deletions

diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 40b5e0b..c13da00 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -366,6 +366,10 @@ const wchar_t kStabilityPageLoadCount[] =
 const wchar_t kStabilityRendererCrashCount[] =
     L"user_experience_metrics.stability.renderer_crash_count";
 
+// Number of times an extension renderer process crashed since the last report.
+const wchar_t kStabilityExtensionRendererCrashCount[] =
+    L"user_experience_metrics.stability.extension_renderer_crash_count";
+
 // Time when the app was last launched, in seconds since the epoch.
 const wchar_t kStabilityLaunchTimeSec[] =
     L"user_experience_metrics.stability.launch_time_sec";
@@ -389,6 +393,12 @@ const wchar_t kStabilityPluginStats[] =
 const wchar_t kStabilityRendererHangCount[] =
     L"user_experience_metrics.stability.renderer_hang_count";
 
+// Total number of child process crashes (other than renderer / extension
+// renderer ones, and plugin children, which are counted separately) since the
+// last report.
+const wchar_t kStabilityChildProcessCrashCount[] =
+    L"user_experience_metrics.stability.child_process_crash_count";
+
 // Number of times the browser has been able to register crash reporting.
 const wchar_t kStabilityBreakpadRegistrationSuccess[] =
     L"user_experience_metrics.stability.breakpad_registration_ok";