Rename ClientDimensions to ClientResolution and add pixel-size and DPI fields.

remoting/host/host_status_observer.h

Index: remoting/host/host_status_observer.h
diff --git a/remoting/host/host_status_observer.h b/remoting/host/host_status_observer.h
index a37e9e48f032c3b2f77edb226240acd26e1b826c..f2e2198c7788fbbb71bdd798dd0400fed17eee6b 100644
--- a/remoting/host/host_status_observer.h
+++ b/remoting/host/host_status_observer.h
@@ -46,9 +46,10 @@ class HostStatusObserver {
                                    const std::string& channel_name,
                                    const protocol::TransportRoute& route) {}
 
-  // Called when the client view dimensions change.
-  virtual void OnClientDimensionsChanged(const std::string& jid,
-                                         const SkISize& size) {}
+  // Called when the client view size or pixel density change.
+  virtual void OnClientResolutionChanged(const std::string& jid,
+                                         const SkISize& size,
+                                         const SkIPoint& dpi) {}
 
   // Called when hosting is started for an account.
   virtual void OnStart(const std::string& xmpp_login) {}