Adding support for sampling crashes in Chrome on Windows.

components/crash/content/app/crash_reporter_client.h

 // 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.
 
 #ifndef COMPONENTS_CRASH_CONTENT_APP_CRASH_REPORTER_CLIENT_H_
 #define COMPONENTS_CRASH_CONTENT_APP_CRASH_REPORTER_CLIENT_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 120 matching lines @@
   // Register all of the potential crash keys that can be sent to the crash
   // reporting server. Returns the size of the union of all keys.
   virtual size_t RegisterCrashKeys();
 
   // Returns true if running in unattended mode (for automated testing).
   virtual bool IsRunningUnattended();
 
   // Returns true if the user has given consent to collect stats.
   virtual bool GetCollectStatsConsent();
 
+  // Returns true if the client is currently in the chosen sample that will
+  // report stats and crashes. Crashes should only be reported if this function
+  // returns true and GetCollectStatsConsent returns true.
+  virtual bool GetCollectStatsInSample();
+
 #if defined(OS_WIN) || defined(OS_MACOSX)
   // Returns true if crash reporting is enforced via management policies. In
   // that case, |breakpad_enabled| is set to the value enforced by policies.
   virtual bool ReportingIsEnforcedByPolicy(bool* breakpad_enabled);
 #endif
 
 #if defined(OS_ANDROID)
   // Returns the descriptor key of the android minidump global descriptor.
   virtual int GetAndroidMinidumpDescriptor();
 
   // Returns true if breakpad microdumps should be enabled. This orthogonal to
   // the standard minidump uploader (which depends on the user consent).
   virtual bool ShouldEnableBreakpadMicrodumps();
 #endif
 
   // Returns true if breakpad should run in the given process type.
   virtual bool EnableBreakpadForProcess(const std::string& process_type);
 };
 
 }  // namespace crash_reporter
 
 #endif  // COMPONENTS_CRASH_CONTENT_APP_CRASH_REPORTER_CLIENT_H_