Use no-op statistics collecting object for WebView.

android_webview/browser/aw_browser_context.cc

Index: android_webview/browser/aw_browser_context.cc
diff --git a/android_webview/browser/aw_browser_context.cc b/android_webview/browser/aw_browser_context.cc
index 098ce73ea4e15025166e93268a27fe7c55158ac8..239dfc40c20d5979fff4f30813bf9a4e04ece86b 100644
--- a/android_webview/browser/aw_browser_context.cc
+++ b/android_webview/browser/aw_browser_context.cc
@@ -20,6 +20,7 @@
 #include "components/data_reduction_proxy/browser/data_reduction_proxy_params.h"
 #include "components/data_reduction_proxy/browser/data_reduction_proxy_prefs.h"
 #include "components/data_reduction_proxy/browser/data_reduction_proxy_settings.h"
+#include "components/data_reduction_proxy/browser/data_reduction_proxy_statistics_prefs.h"
 #include "components/user_prefs/user_prefs.h"
 #include "components/visitedlink/browser/visitedlink_master.h"
 #include "content/public/browser/browser_thread.h"
@@ -94,6 +95,10 @@ void AwBrowserContext::SetDataReductionProxyEnabled(bool enabled) {
       context->GetDataReductionProxySettings();
   if (proxy_settings == NULL)
     return;
+
+  context->CreateDataReductionProxyStatisticsIfNecessary();
+  proxy_settings->SetDataReductionProxyStatisticsPrefs(
+      context->data_reduction_proxy_statistics_.get());
   proxy_settings->SetDataReductionProxyEnabled(data_reduction_proxy_enabled_);
 }
 
@@ -294,4 +299,19 @@ void AwBrowserContext::RebuildTable(
   enumerator->OnComplete(true);
 }
 
+void AwBrowserContext::CreateDataReductionProxyStatisticsIfNecessary() {
+  DCHECK(user_pref_service_.get());
+
+  if (!data_reduction_proxy_statistics_.get()) {
+    // We don't care about commit_delay for now. It is just a dummy value.
+    base::TimeDelta commit_delay = base::TimeDelta::FromMinutes(60);
+    data_reduction_proxy_statistics_ =
+        scoped_ptr<data_reduction_proxy::DataReductionProxyStatisticsPrefs>(
+            new data_reduction_proxy::DataReductionProxyStatisticsPrefs(
+                user_pref_service_.get(),
+                base::MessageLoopProxy::current(),
+                commit_delay));
+  }
+}
+
 }  // namespace android_webview