Reland: 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..fc8a42ef8902ba6ce2104f4da2d999232c378d80 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_statistics.h"
 #include "blimp/net/blimp_message_processor.h"
 
 namespace net {
@@ -70,6 +71,8 @@ class BlimpClientSession : public NetworkEventObserver {
   RenderWidgetFeature* GetRenderWidgetFeature() const;
   SettingsFeature* GetSettingsFeature() const;
 
+  BlimpConnectionStatistics* GetBlimpConnectionStatistics() const;
+
   // The AssignmentCallback for when an assignment is ready. This will trigger
   // a connection to the engine.
   virtual void ConnectWithAssignment(AssignmentSource::Result result,
@@ -101,6 +104,10 @@ 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. Ownership is maintained on the IO thread.
+  BlimpConnectionStatistics* blimp_connection_statistics_;
+
   // Container struct for network components.
   // Must be deleted on the IO thread.
   std::unique_ptr<ClientNetworkComponents> net_components_;