[Tentaive patch for discussion] Add Purge+Suspend metrics as UMA.

content/public/test/mock_render_process_host.cc

 // Copyright (c) 2012 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 "content/public/test/mock_render_process_host.h"
 
 #include <algorithm>
 #include <utility>
 #include <vector>
 
@@ skipping 294 matching lines @@
 void MockRenderProcessHost::ForceReleaseWorkerRefCounts() {
   worker_ref_count_ = 0;
 }
 
 bool MockRenderProcessHost::IsWorkerRefCountDisabled() {
   return false;
 }
 
 void MockRenderProcessHost::PurgeAndSuspend() {}
 
+const base::TimeTicks& MockRenderProcessHost::GetLastPurgeAndSuspendTime()
+    const {
+  static base::TimeTicks dummy_time = base::TimeTicks::Now();
+  return dummy_time;
+}
+
 void MockRenderProcessHost::FilterURL(bool empty_allowed, GURL* url) {
   RenderProcessHostImpl::FilterURL(this, empty_allowed, url);
 }
 
 #if defined(ENABLE_WEBRTC)
 void MockRenderProcessHost::EnableAudioDebugRecordings(
     const base::FilePath& file) {
 }
 
 void MockRenderProcessHost::DisableAudioDebugRecordings() {}
@@ skipping 60 matching lines @@
   for (ScopedVector<MockRenderProcessHost>::iterator it = processes_.begin();
        it != processes_.end(); ++it) {
     if (*it == host) {
       processes_.weak_erase(it);
       break;
     }
   }
 }
 
 }  // namespace content