Implement Google network speech synthesis.

See bug for context. Implements a component extension
that provides speech synthesis using Google's speech
synthesis API.

Adds a "remote" flag to the TTS and TTS Engine APIs
so that it's possible for clients to distinguish
between local and remote speech engines.

Adds a new private extension API to expose Google's
API key, needed to make the request.

BUG=308250

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=232242

Review URL: https://codereview.chromium.org/27034009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232412 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 33 insertions, 1 deletions

diff --git a/chrome/common/extensions/api/speech/tts_engine_manifest_handler.cc b/chrome/common/extensions/api/speech/tts_engine_manifest_handler.cc
index bed4937..e18c594 100644
--- a/chrome/common/extensions/api/speech/tts_engine_manifest_handler.cc
+++ b/chrome/common/extensions/api/speech/tts_engine_manifest_handler.cc
@@ -29,7 +29,8 @@ struct TtsVoices : public Extension::ManifestData {
 
 }  // namespace
 
-TtsVoice::TtsVoice() {}
+TtsVoice::TtsVoice() : remote(false) {}
+
 TtsVoice::~TtsVoice() {}
 
 // static
@@ -95,6 +96,13 @@ bool TtsEngineManifestHandler::Parse(Extension* extension, string16* error) {
         return false;
       }
     }
+    if (one_tts_voice->HasKey(keys::kTtsVoicesRemote)) {
+      if (!one_tts_voice->GetBoolean(
+              keys::kTtsVoicesRemote, &voice_data.remote)) {
+        *error = ASCIIToUTF16(errors::kInvalidTtsVoicesRemote);
+        return false;
+      }
+    }
     if (one_tts_voice->HasKey(keys::kTtsVoicesEventTypes)) {
       const base::ListValue* event_types_list;
       if (!one_tts_voice->GetList(
diff --git a/chrome/common/extensions/api/speech/tts_engine_manifest_handler.h b/chrome/common/extensions/api/speech/tts_engine_manifest_handler.h
index 71d8e05..13b194b 100644
--- a/chrome/common/extensions/api/speech/tts_engine_manifest_handler.h
+++ b/chrome/common/extensions/api/speech/tts_engine_manifest_handler.h
@@ -21,6 +21,7 @@ struct TtsVoice {
   std::string voice_name;
   std::string lang;
   std::string gender;
+  bool remote;
   std::set<std::string> event_types;
 
   static const std::vector<TtsVoice>* GetTtsVoices(const Extension* extension);
diff --git a/chrome/common/extensions/api/system_private.json b/chrome/common/extensions/api/system_private.json
index 7d95450..ea9ae38 100644
--- a/chrome/common/extensions/api/system_private.json
+++ b/chrome/common/extensions/api/system_private.json
@@ -86,6 +86,24 @@
             ]
           }
         ]
+      },
+      {
+        "name": "getApiKey",
+        "type": "function",
+        "description": "Gets Chrome's API key to use for requests to Google services.",
+        "parameters": [
+          {
+            "type": "function",
+            "name": "callback",
+            "parameters": [
+              {
+                "name": "key",
+                "type": "string",
+                "description": "The API key."
+              }
+            ]
+          }
+        ]
       }
     ],
     "events": [
diff --git a/chrome/common/extensions/api/tts.json b/chrome/common/extensions/api/tts.json
index ae8771e..995968ca 100644
--- a/chrome/common/extensions/api/tts.json
+++ b/chrome/common/extensions/api/tts.json
@@ -62,6 +62,11 @@
             "description": "This voice's gender.",
             "enum": ["male", "female"]
           },
+          "remote": {
+            "type": "boolean",
+            "optional": true,
+            "description": "If true, the synthesis engine is a remote network resource. It may be higher latency and may incur bandwidth costs."
+          },
           "extensionId": {
             "type": "string",
             "optional": true,