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

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

Index: chrome/browser/extensions/api/input_ime/input_ime_api_chromeos.cc
diff --git a/chrome/browser/extensions/api/input_ime/input_ime_api_chromeos.cc b/chrome/browser/extensions/api/input_ime/input_ime_api_chromeos.cc
index db2ad970f82df0cc7c23f70e2ea121c094bc6eb5..0a51b00ebe8589042b6ae751b672fd388f635b3e 100644
--- a/chrome/browser/extensions/api/input_ime/input_ime_api_chromeos.cc
+++ b/chrome/browser/extensions/api/input_ime/input_ime_api_chromeos.cc
@@ -286,6 +286,11 @@ class ImeObserverChromeOS : public ui::ImeObserver {
 
 namespace extensions {
 
+InputImeEventRouter::InputImeEventRouter(Profile* profile)
+    : InputImeEventRouterBase(profile) {}
+
+InputImeEventRouter::~InputImeEventRouter() {}
+
 bool InputImeEventRouter::RegisterImeExtension(
     const std::string& extension_id,
     const std::vector<extensions::InputComponentInfo>& input_components) {
@@ -354,6 +359,25 @@ void InputImeEventRouter::UnregisterAllImes(const std::string& extension_id) {
   }
 }
 
+IMEEngineHandlerInterface* InputImeEventRouter::GetEngine(
+    const std::string& extension_id,
+    const std::string& component_id) {
+  std::map<std::string, IMEEngineHandlerInterface*>::iterator it =
+      engine_map_.find(extension_id);
+  if (it != engine_map_.end())
+    return it->second;
+  return NULL;
+}
+
+IMEEngineHandlerInterface* InputImeEventRouter::GetActiveEngine(
+    const std::string& extension_id) {
+  std::map<std::string, IMEEngineHandlerInterface*>::iterator it =
+      engine_map_.find(extension_id);
+  if (it != engine_map_.end() && it->second->IsActive())
+    return it->second;
+  return NULL;
+}
+
 bool InputImeSetCompositionFunction::RunSync() {
   IMEEngineHandlerInterface* engine =
       GetInputImeEventRouter(Profile::FromBrowserContext(browser_context()))
@@ -692,4 +716,38 @@ bool InputImeDeleteSurroundingTextFunction::RunSync() {
   return true;
 }
 
+void InputImeAPI::OnExtensionLoaded(content::BrowserContext* browser_context,
+                                    const Extension* extension) {
+  const std::vector<InputComponentInfo>* input_components =
+      extensions::InputComponents::GetInputComponents(extension);

[Devlin, 2016/01/07 23:08:29]

no need for extensions:: prefix.

[Azure Wei, 2016/01/08 06:40:55]

Done.

+  if (input_components)
+    GetInputImeEventRouter(Profile::FromBrowserContext(browser_context))
+        ->RegisterImeExtension(extension->id(), *input_components);
+}
+
+void InputImeAPI::OnExtensionUnloaded(content::BrowserContext* browser_context,
+                                      const Extension* extension,
+                                      UnloadedExtensionInfo::Reason reason) {
+  const std::vector<InputComponentInfo>* input_components =
+      extensions::InputComponents::GetInputComponents(extension);
+  if (!input_components)
+    return;
+  if (input_components->size() > 0) {

[Devlin, 2016/01/07 23:08:29]

cleaner as:
if (input_components && !input_components->empty()) {
  // Unregister
}

[Azure Wei, 2016/01/08 06:40:55]

Done.

+    GetInputImeEventRouter(Profile::FromBrowserContext(browser_context))
+        ->UnregisterAllImes(extension->id());
+  }
+}
+
+void InputImeAPI::OnListenerAdded(const EventListenerInfo& details) {
+  if (!details.browser_context)
+    return;
+  IMEEngineHandlerInterface* engine =
+      GetInputImeEventRouter(
+          Profile::FromBrowserContext(details.browser_context))
+          ->GetActiveEngine(details.extension_id);
+  // Notifies the IME extension for IME ready with onActivate/onFocus events.
+  if (engine)

[Devlin, 2016/01/07 23:08:29]

When is |engine| null?

[Azure Wei, 2016/01/08 06:40:55]

The engine could be null if the current extension doesn't have an active engine.

+    engine->Enable(engine->GetActiveComponentId());
+}
+
 }  // namespace extensions