Add renderer launch count to stability metrics.

components/metrics/proto/system_profile.proto

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Stores information about the user's brower and system configuration.
 // The system configuration fields are recorded once per client session.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
@@ skipping 422 matching lines @@
     optional bool is_disabled = 4;
 
     // True if the plugin is PPAPI.
     optional bool is_pepper = 5;
   }
   repeated Plugin plugin = 7;
 
   // Figures that can be used to generate application stability metrics.
   // All values are counts of events since the last time that these
   // values were reported.
-  // Next tag: 26
+  // Next tag: 28
   message Stability {
     // Total amount of time that the program was running, in seconds,
     // since the last time a log was recorded, as measured using a client-side
     // clock implemented via TimeTicks, which guarantees that it is monotonic
     // and does not jump if the user changes their clock.  The TimeTicks
     // implementation also makes the clock not count time the computer is
     // suspended.
     optional int64 incremental_uptime_sec = 1;
 
     // Total amount of time that the program was running, in seconds,
     // since startup, as measured using a client-side clock implemented
     // via TimeTicks, which guarantees that it is monotonic and does not
     // jump if the user changes their clock.  The TimeTicks implementation
     // also makes the clock not count time the computer is suspended.
     // This field was added for M-35.
     optional int64 uptime_sec = 23;
 
-    // Page loads along with renderer crashes, hangs and failed launches, since
-    // page load count roughly corresponds to usage.
+    // Page loads along with renderer launches, crashes, hangs and failed
+    // launches, since page load count roughly corresponds to usage.
     optional int32 page_load_count = 2;
     optional int32 renderer_crash_count = 3;
     optional int32 renderer_hang_count = 4;
     optional int32 renderer_failed_launch_count = 24;
+    optional int32 renderer_launch_count = 26;
 
-    // Number of renderer crashes and failed launches that were for extensions.
-    // These are not counted in the renderer counts above.
+    // Number of renderer launches, crashes and failed launches that were for
+    // extensions. These are not counted in the renderer counts above.
     optional int32 extension_renderer_crash_count = 5;
     optional int32 extension_renderer_failed_launch_count = 25;
+    optional int32 extension_renderer_launch_count = 27;
 
     // Number of non-renderer child process crashes.
     optional int32 child_process_crash_count = 6;
 
     // Number of times the browser has crashed while logged in as the "other
     // user" (guest) account.
     // Logged on ChromeOS only.
     optional int32 other_user_crash_count = 7;
 
     // Number of times the kernel has crashed.
@@ skipping 327 matching lines @@
 
     // The hash of the product version. Might not be set if the product version
     // could not be obtained from the disk.
     optional fixed32 product_version_hash = 4;
 
     // The current state of the product.
     optional AntiVirusState product_state = 5;
   }
   repeated AntiVirusProduct antivirus_product = 23;
 }