[bgmode] Log the unpin stack trace to Crash Keys

chrome/app/chrome_crash_reporter_client_win.cc

 // Copyright 2013 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.
 
 // TODO(ananta/scottmg)
 // Add test coverage for Crashpad.
 #include "chrome/app/chrome_crash_reporter_client_win.h"
 
 #include <assert.h>
 #include <windows.h>
@@ skipping 22 matching lines @@
 constexpr char kActiveURL[] = "url-chunk";
 constexpr char kFontKeyName[] = "font_key_name";
 
 // Installed extensions. |kExtensionID| should be formatted with an integer,
 // in the range [0, kExtensionIDMaxCount).
 constexpr char kNumExtensionsCount[] = "num-extensions";
 constexpr size_t kExtensionIDMaxCount = 10;
 constexpr char kExtensionID[] = "extension-%" PRIuS;
 
 constexpr char kShutdownType[] = "shutdown-type";
+constexpr char kBrowserUnpinTrace[] = "browser-unpin-trace";
 
 constexpr char kGPUVendorID[] = "gpu-venid";
 constexpr char kGPUDeviceID[] = "gpu-devid";
 constexpr char kGPUDriverVersion[] = "gpu-driver";
 constexpr char kGPUPixelShaderVersion[] = "gpu-psver";
 constexpr char kGPUVertexShaderVersion[] = "gpu-vsver";
 
 constexpr char kHungAudioThreadDetails[] = "hung-audio-thread-details";
 constexpr char kHungRendererOutstandingAckCount[] = "hung-outstanding-acks";
 constexpr char kHungRendererOutstandingEventType[] =
@@ skipping 37 matching lines @@
   // //chrome/common/crash_keys.cc::RegisterChromeCrashKeys() and
   // //blimp/engine/app/blimp_engine_crash_keys.cc
   constexpr base::debug::CrashKey fixed_keys[] = {
       {kMetricsClientId, kSmallSize},
       {kChannel, kSmallSize},
       {kActiveURL, kLargeSize},
       {kNumVariations, kSmallSize},
       {kVariations, kLargeSize},
       {kNumExtensionsCount, kSmallSize},
       {kShutdownType, kSmallSize},
+      {kBrowserUnpinTrace, kMediumSize},
       {kGPUVendorID, kSmallSize},
       {kGPUDeviceID, kSmallSize},
       {kGPUDriverVersion, kSmallSize},
       {kGPUPixelShaderVersion, kSmallSize},
       {kGPUVertexShaderVersion, kSmallSize},
 
       // browser/:
       {kThirdPartyModulesLoaded, kSmallSize},
       {kThirdPartyModulesNotLoaded, kSmallSize},
       {kEnrolledToDomain, kSmallSize},
@@ skipping 292 matching lines @@
 bool ChromeCrashReporterClient::GetCollectStatsInSample() {
   return install_static::GetCollectStatsInSample();
 }
 
 bool ChromeCrashReporterClient::EnableBreakpadForProcess(
     const std::string& process_type) {
   // This is not used by Crashpad (at least on Windows).
   NOTREACHED();
   return true;
 }