Added network components for blimp text input feature

blimp/engine/session/blimp_engine_session.h

Index: blimp/engine/session/blimp_engine_session.h
diff --git a/blimp/engine/session/blimp_engine_session.h b/blimp/engine/session/blimp_engine_session.h
index ae527e5fcd7eb87f53a38a28ac05ec7d6fe3b7b4..5bde15e2ecbe8b6b429df751ad24dc0cfceda76a 100644
--- a/blimp/engine/session/blimp_engine_session.h
+++ b/blimp/engine/session/blimp_engine_session.h
@@ -19,6 +19,7 @@
 #include "content/public/browser/web_contents_delegate.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "net/base/completion_callback.h"
+#include "ui/base/ime/input_method_observer.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace aura {
@@ -69,6 +70,7 @@ class BlimpEngineSession
     : public BlimpMessageProcessor,
       public content::WebContentsDelegate,
       public content::WebContentsObserver,
+      public ui::InputMethodObserver,
       public EngineRenderWidgetFeature::RenderWidgetMessageDelegate {
  public:
   BlimpEngineSession(scoped_ptr<BlimpBrowserContext> browser_context,
@@ -137,6 +139,15 @@ class BlimpEngineSession
   void NavigationStateChanged(content::WebContents* source,
                               content::InvalidateTypes changed_flags) override;
 
+  // ui::InputMethodObserver overrides.
+  void OnTextInputTypeChanged(const ui::TextInputClient* client) override;
+  void OnFocus() override;
+  void OnBlur() override;
+  void OnCaretBoundsChanged(const ui::TextInputClient* client) override;
+  void OnTextInputStateChanged(const ui::TextInputClient* client) override;
+  void OnInputMethodDestroyed(const ui::InputMethod* input_method) override;
+  void OnShowImeIfNeeded() override;
+
   // content::WebContentsObserver implementation.
   void RenderViewCreated(content::RenderViewHost* render_view_host) override;
   void RenderViewHostChanged(content::RenderViewHost* old_host,