Remove the dependency of Extension API from tts_chromeos

Moving the extension api dependency from TtsPlatformImplChromeOs
to TtsExtensionEngine through TtsEngineDelegate.
This is part of an effort to move TTS to content.

BUG=347045

Review URL: https://codereview.chromium.org/434083003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287160 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/speech/extension_api/tts_engine_extension_api.cc

@@ -8,11 +8,15 @@
 
 #include "base/json/json_writer.h"
 #include "base/values.h"
+#include "chrome/browser/extensions/component_loader.h"
+#include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/speech/extension_api/tts_engine_extension_observer.h"
 #include "chrome/browser/speech/extension_api/tts_extension_api.h"
 #include "chrome/browser/speech/extension_api/tts_extension_api_constants.h"
 #include "chrome/browser/speech/tts_controller.h"
 #include "chrome/common/extensions/api/speech/tts_engine_manifest_handler.h"
+#include "chrome/common/extensions/extension_constants.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/common/console_message_level.h"
@@ -210,6 +214,26 @@ void TtsExtensionEngine::Resume(Utterance* utterance) {
   WarnIfMissingPauseOrResumeListener(profile, event_router, id);
 }
 
+bool TtsExtensionEngine::LoadBuiltInTtsExtension(Profile* profile) {
+#if defined(OS_CHROMEOS)
+  // Check to see if the engine was previously loaded.
+  if (TtsEngineExtensionObserver::GetInstance(profile)->SawExtensionLoad(
+          extension_misc::kSpeechSynthesisExtensionId, true)) {
+    return false;
+  }
+
+  // Load the component extension into this profile.
+  ExtensionService* extension_service =
+      extensions::ExtensionSystem::Get(profile)->extension_service();
+  DCHECK(extension_service);
+  extension_service->component_loader()
+      ->AddChromeOsSpeechSynthesisExtension();
+  return true;
+#else
+  return false;
+#endif
+}
+
 bool ExtensionTtsEngineSendTtsEventFunction::RunSync() {
   int utterance_id;
   EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(0, &utterance_id));

chrome/browser/speech/extension_api/tts_engine_extension_api.h

@@ -40,6 +40,7 @@ class TtsExtensionEngine : public TtsEngineDelegate {
   virtual void Stop(Utterance* utterance) OVERRIDE;
   virtual void Pause(Utterance* utterance) OVERRIDE;
   virtual void Resume(Utterance* utterance) OVERRIDE;
+  virtual bool LoadBuiltInTtsExtension(Profile* profile) OVERRIDE;
 };
 
 // Hidden/internal extension function used to allow TTS engine extensions

chrome/browser/speech/tts_chromeos.cc

@@ -2,20 +2,16 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/extensions/component_loader.h"
-#include "chrome/browser/extensions/extension_service.h"
-#include "chrome/browser/profiles/profile.h"
-#include "chrome/browser/speech/extension_api/tts_engine_extension_observer.h"
 #include "chrome/browser/speech/tts_platform.h"
-#include "chrome/common/extensions/extension_constants.h"
-#include "extensions/browser/extension_system.h"
 
 // Chrome OS doesn't have native TTS, instead it includes a built-in
 // component extension that provides speech synthesis. This class includes
 // an implementation of LoadBuiltInTtsExtension and dummy implementations of
 // everything else.
-class TtsPlatformImplChromeOs
-    : public TtsPlatformImpl {
+
+class Profile;
+
+class TtsPlatformImplChromeOs : public TtsPlatformImpl {
  public:
   // TtsPlatformImpl overrides:
   virtual bool PlatformImplAvailable() OVERRIDE {
@@ -23,19 +19,11 @@ class TtsPlatformImplChromeOs
   }
 
   virtual bool LoadBuiltInTtsExtension(Profile* profile) OVERRIDE {
-    // Check to see if the engine was previously loaded.
-    if (TtsEngineExtensionObserver::GetInstance(profile)->SawExtensionLoad(
-            extension_misc::kSpeechSynthesisExtensionId, true)) {
-      return false;
-    }
-
-    // Load the component extension into this profile.
-    ExtensionService* extension_service =
-        extensions::ExtensionSystem::Get(profile)->extension_service();
-    DCHECK(extension_service);
-    extension_service->component_loader()
-        ->AddChromeOsSpeechSynthesisExtension();
-    return true;
+    TtsEngineDelegate* tts_engine_delegate =
+        TtsController::GetInstance()->GetTtsEngineDelegate();
+    if (tts_engine_delegate)
+      return tts_engine_delegate->LoadBuiltInTtsExtension(profile);
+    return false;
   }
 
   virtual bool Speak(

chrome/browser/speech/tts_controller.h

@@ -98,6 +98,9 @@ class TtsEngineDelegate {
 
   // Resume speaking this utterance.
   virtual void Resume(Utterance* utterance) = 0;
+
+  // Load the built-in component extension for ChromeOS.
+  virtual bool LoadBuiltInTtsExtension(Profile* profile) = 0;
 };
 
 // Class that wants to receive events on utterances.
@@ -321,6 +324,10 @@ class TtsController {
   // extensions.
   virtual void SetTtsEngineDelegate(TtsEngineDelegate* delegate) = 0;
 
+  // Get the delegate that processes TTS requests with user-installed
+  // extensions.
+  virtual TtsEngineDelegate* GetTtsEngineDelegate() = 0;
+
   // For unit testing.
   virtual void SetPlatformImpl(TtsPlatformImpl* platform_impl) = 0;
   virtual int QueueSize() = 0;

chrome/browser/speech/tts_controller_impl.cc

@@ -457,3 +457,7 @@ void TtsControllerImpl::SetTtsEngineDelegate(
     TtsEngineDelegate* delegate) {
   tts_engine_delegate_ = delegate;
 }
+
+TtsEngineDelegate* TtsControllerImpl::GetTtsEngineDelegate() {
+  return tts_engine_delegate_;
+}

chrome/browser/speech/tts_controller_impl.h

@@ -42,6 +42,7 @@ class TtsControllerImpl : public TtsController {
   virtual void RemoveVoicesChangedDelegate(
       VoicesChangedDelegate* delegate) OVERRIDE;
   virtual void SetTtsEngineDelegate(TtsEngineDelegate* delegate) OVERRIDE;
+  virtual TtsEngineDelegate* GetTtsEngineDelegate() OVERRIDE;
   virtual void SetPlatformImpl(TtsPlatformImpl* platform_impl) OVERRIDE;
   virtual int QueueSize() OVERRIDE;