Add a compile time flag to only upload crash symbols for official builds

blimp/engine/app/blimp_engine_crash_reporter_client.cc

 // Copyright 2016 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.
 
 #include "blimp/engine/app/blimp_engine_crash_reporter_client.h"
 
 #include "blimp/engine/app/blimp_engine_crash_keys.h"
 #include "components/crash/core/common/crash_keys.h"
 #include "components/version_info/version_info_values.h"
 #include "content/public/common/content_switches.h"
@@ skipping 27 matching lines @@
 
 bool BlimpEngineCrashReporterClient::IsRunningUnattended() {
   // If this returns "true," crash reports will not be uploaded. For now the
   // engine will not be running unattended. Eventually when automated testing
   // harnesses are set up, this should be changed to return "true" in those
   // cases.
   return false;
 }
 
 bool BlimpEngineCrashReporterClient::GetCollectStatsConsent() {
-  // Always collect Blimp engine crash reports.
+  // Always collect Blimp engine crash reports on official builds.
+#ifdef OFFICIAL_BUILD
   return true;
+#else
+  return false;
+#endif  // OFFICIAL_BUILD
 }
 
 bool BlimpEngineCrashReporterClient::EnableBreakpadForProcess(
     const std::string& process_type) {
   return process_type == ::switches::kRendererProcess ||
          process_type == ::switches::kPpapiPluginProcess ||
          process_type == ::switches::kZygoteProcess ||
          process_type == ::switches::kGpuProcess;
 }
 
 }  // namespace engine
 }  // namespace blimp