Added a debug info UI for Blimp

blimp/client/session/blimp_client_session.h

Index: blimp/client/session/blimp_client_session.h
diff --git a/blimp/client/session/blimp_client_session.h b/blimp/client/session/blimp_client_session.h
index 71b4d3d0cf6b953ea465672811788d050b10311a..8cb6dd230cc8690f84b0ec7b47f102139586f457 100644
--- a/blimp/client/session/blimp_client_session.h
+++ b/blimp/client/session/blimp_client_session.h
@@ -13,6 +13,7 @@
 #include "base/threading/thread.h"
 #include "blimp/client/session/assignment_source.h"
 #include "blimp/common/proto/blimp_message.pb.h"
+#include "blimp/net/blimp_connection_details.h"
 #include "blimp/net/blimp_message_processor.h"
 
 namespace net {
@@ -53,7 +54,8 @@ class NetworkEventObserver {
 // This session glues together the feature proxy components and the network
 // layer.  The network components must be interacted with on the IO thread.  The
 // feature proxies must be interacted with on the UI thread.
-class BlimpClientSession : public NetworkEventObserver {
+class BlimpClientSession : public NetworkEventObserver,
+                           public NetworkActivityObserver {
  public:
   explicit BlimpClientSession(const GURL& assigner_endpoint);
 
@@ -70,6 +72,8 @@ class BlimpClientSession : public NetworkEventObserver {
   RenderWidgetFeature* GetRenderWidgetFeature() const;
   SettingsFeature* GetSettingsFeature() const;
 
+  BlimpConnectionDetails* GetBlimpConnectionDetails() const;
+
   // The AssignmentCallback for when an assignment is ready. This will trigger
   // a connection to the engine.
   virtual void ConnectWithAssignment(AssignmentSource::Result result,
@@ -82,10 +86,14 @@ class BlimpClientSession : public NetworkEventObserver {
   // assignment request.
   virtual void OnAssignmentConnectionAttempted(AssignmentSource::Result result,
                                                const Assignment& assignment);
+  void EnableDebugInfo(bool enable);
 
  private:
   void RegisterFeatures();
 
+  // NetworkActivityObserver implementation.
+  void UpdateDebugInfo(int received, int sent, int commits) override;
+
   // NetworkEventObserver implementation.
   void OnConnected() override;
   void OnDisconnected(int result) override;
@@ -101,6 +109,10 @@ class BlimpClientSession : public NetworkEventObserver {
   // Connect() to get a valid assignment and later connect to the engine.
   std::unique_ptr<AssignmentSource> assignment_source_;
 
+  // Collects details of network, such as number of commits and bytes
+  // transferred over network.
+  std::unique_ptr<BlimpConnectionDetails> blimp_connection_details_;
+
   // Container struct for network components.
   // Must be deleted on the IO thread.
   std::unique_ptr<ClientNetworkComponents> net_components_;