Build chrome.input.ime.* API in GN mode.

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

Index: chrome/browser/extensions/api/input_ime/input_ime_api_chromeos.h
diff --git a/chrome/browser/extensions/api/input_ime/input_ime_api_chromeos.h b/chrome/browser/extensions/api/input_ime/input_ime_api_chromeos.h
index dd115ccf6e01aef97b32bb8771b625d7cf30705a..59a07b6922cc9bef45202061a6c9f1a6803b14dd 100644
--- a/chrome/browser/extensions/api/input_ime/input_ime_api_chromeos.h
+++ b/chrome/browser/extensions/api/input_ime/input_ime_api_chromeos.h
@@ -5,9 +5,22 @@
 #ifndef CHROME_BROWSER_EXTENSIONS_API_INPUT_IME_INPUT_IME_API_CHROMEOS_H_
 #define CHROME_BROWSER_EXTENSIONS_API_INPUT_IME_INPUT_IME_API_CHROMEOS_H_
 
+#include <map>
+
+#include "chrome/browser/extensions/api/input_ime/input_ime_event_router_base.h"
+#include "chrome/browser/profiles/profile.h"
 #include "extensions/browser/extension_function.h"
+#include "ui/base/ime/ime_engine_handler_interface.h"
+
+class Profile;
+
+namespace ui {
+class IMEEngineHandlerInterface;
+}  // namespace ui
 
 namespace extensions {
+class InputImeEventRouterBase;
+struct InputComponentInfo;
 
 class InputImeSetCompositionFunction : public SyncExtensionFunction {
  public:
@@ -138,6 +151,28 @@ class InputImeHideInputViewFunction : public AsyncExtensionFunction {
   bool RunAsync() override;
 };
 
+class InputImeEventRouter : public InputImeEventRouterBase {
+ public:
+  explicit InputImeEventRouter(Profile* profile);
+  ~InputImeEventRouter() override;
+
+  bool RegisterImeExtension(
+      const std::string& extension_id,
+      const std::vector<extensions::InputComponentInfo>& input_components);
+  void UnregisterAllImes(const std::string& extension_id);
+
+  ui::IMEEngineHandlerInterface* GetEngine(const std::string& extension_id,
+                                           const std::string& component_id);
+  ui::IMEEngineHandlerInterface* GetActiveEngine(
+      const std::string& extension_id);
+
+ private:
+  // The engine map from extension_id to an engine.
+  std::map<std::string, ui::IMEEngineHandlerInterface*> engine_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(InputImeEventRouter);
+};
+
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_INPUT_IME_INPUT_IME_API_CHROMEOS_H_