Change some functions in ImeEngineObserver as not ChromeOS-only.

chrome/browser/extensions/api/input_ime/input_ime_api.h

Index: chrome/browser/extensions/api/input_ime/input_ime_api.h
diff --git a/chrome/browser/extensions/api/input_ime/input_ime_api.h b/chrome/browser/extensions/api/input_ime/input_ime_api.h
index 8b34769453f076bd73d7cc9df2b3d37318534cc3..640823d0fdedd63eac435ceb4f35e00776dd0f20 100644
--- a/chrome/browser/extensions/api/input_ime/input_ime_api.h
+++ b/chrome/browser/extensions/api/input_ime/input_ime_api.h
@@ -42,6 +42,7 @@ class ImeObserver : public IMEEngineObserver {
   ~ImeObserver() override {}
 
   // IMEEngineObserver overrides.
+  void OnActivate(const std::string& component_id) override;
   void OnFocus(const IMEEngineHandlerInterface::InputContext& context) override;
   void OnBlur(int context_id) override;
   void OnKeyEvent(
@@ -52,6 +53,12 @@ class ImeObserver : public IMEEngineObserver {
   void OnDeactivated(const std::string& component_id) override;
   void OnCompositionBoundsChanged(
       const std::vector<gfx::Rect>& bounds) override;
+  bool IsInterestedInKeyEvent() const override;
+  void OnSurroundingTextChanged(const std::string& component_id,
+                                const std::string& text,
+                                int cursor_pos,
+                                int anchor_pos,
+                                int offset_pos) override;
 
  protected:
   // Helper function used to forward the given event to the |profile_|'s event
@@ -61,6 +68,9 @@ class ImeObserver : public IMEEngineObserver {
       const std::string& event_name,
       scoped_ptr<base::ListValue> args) = 0;
 
+  // Returns the type of the current screen.
+  virtual std::string GetCurrentScreenType() = 0;
+
   // Returns true if the extension is ready to accept key event, otherwise
   // returns false.
   bool ShouldForwardKeyEvent() const;