Expose UkmService to content/

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index ec24674e6965b27439b3f824f3c2c26f45ca6a6b..4c35c6c8b94f1e3d3430552bb440234b47cc0527 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -87,6 +87,10 @@ namespace rappor {
 class RapporService;
 }
 
+namespace ukm {
+class UkmService;
+}
+
 namespace sandbox {
 class TargetPolicy;
 }
@@ -820,6 +824,9 @@ class CONTENT_EXPORT ContentBrowserClient {
   // Returns the RapporService from the browser process.
   virtual ::rappor::RapporService* GetRapporService();
 
+  // Returns the UKMService from the browser process.
+  virtual ::ukm::UkmService* GetUkmService();
+
   // Provides parameters for initializing the global task scheduler. Default
   // params are used if this returns nullptr.
   virtual std::unique_ptr<base::TaskScheduler::InitParams>