[Chromecast] Moves persistent UMA client ID handling to common code.

chromecast/browser/cast_content_browser_client.h

Index: chromecast/browser/cast_content_browser_client.h
diff --git a/chromecast/browser/cast_content_browser_client.h b/chromecast/browser/cast_content_browser_client.h
index 9a1d10accdcdcfe5d2508a2d36460b2299efe998..25ca3f95ac34a82c8fbc32de565c254c316071a4 100644
--- a/chromecast/browser/cast_content_browser_client.h
+++ b/chromecast/browser/cast_content_browser_client.h
@@ -25,8 +25,8 @@ namespace media {
 class AudioManagerFactory;
 }
 
-namespace net {
-class HostResolver;
+namespace metrics {
+class MetricsService;
 }
 
 namespace chromecast {
@@ -40,7 +40,7 @@ namespace shell {
 class CastBrowserMainParts;
 class URLRequestContextFactory;
 
-class CastContentBrowserClient: public content::ContentBrowserClient {
+class CastContentBrowserClient : public content::ContentBrowserClient {
  public:
   // Creates an implementation of CastContentBrowserClient. Platform should
   // link in an implementation as needed.
@@ -69,6 +69,13 @@ class CastContentBrowserClient: public content::ContentBrowserClient {
   // Performs cleanup for process exit (but before AtExitManager cleanup).
   void ProcessExiting();
 
+  // Invoked when the metrics client ID changes.
+  virtual void SetMetricsClientId(const std::string& client_id);
+
+  // Allows registration of extra metrics providers.
+  virtual void RegisterMetricsProviders(
+      ::metrics::MetricsService* metrics_service);
+
   // content::ContentBrowserClient implementation:
   content::BrowserMainParts* CreateBrowserMainParts(
       const content::MainFunctionParams& parameters) override;