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..bbb7dbd9f889945f660b89f3970980036b727d27 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 +139,18 @@ class BlimpEngineSession
   void NavigationStateChanged(content::WebContents* source,
                               content::InvalidateTypes changed_flags) override;
 
+  // ui::InputMethodObserver overrides.

[nyquist, 2016/03/10 00:57:13]

Could this either move to the EngineRenderWidgetFeature, or a new feature
specific to IME?

+  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;
+
+  // Used to show/hide IME when user selects text input.
+  void ShowIme(bool show);

[nyquist, 2016/03/10 00:57:13]

Can this be private?

+
   // content::WebContentsObserver implementation.
   void RenderViewCreated(content::RenderViewHost* render_view_host) override;
   void RenderViewHostChanged(content::RenderViewHost* old_host,
@@ -186,6 +200,7 @@ class BlimpEngineSession
   // Used to send TAB_CONTROL or NAVIGATION messages to client.
   scoped_ptr<BlimpMessageProcessor> tab_control_message_sender_;
   scoped_ptr<BlimpMessageProcessor> navigation_message_sender_;
+  scoped_ptr<BlimpMessageProcessor> ime_message_sender_;
 
   DISALLOW_COPY_AND_ASSIGN(BlimpEngineSession);
 };