Add code to support options for TTS speak.

chrome/browser/extensions/extension_tts_api.cc

Index: chrome/browser/extensions/extension_tts_api.cc
===================================================================
--- chrome/browser/extensions/extension_tts_api.cc	(revision 56764)
+++ chrome/browser/extensions/extension_tts_api.cc	(working copy)
@@ -7,19 +7,84 @@
 #include <string>
 
 #include "base/values.h"
+#include "base/string_number_conversions.h"
 
 #include "chrome/browser/chromeos/cros/cros_library.h"
 #include "chrome/browser/chromeos/cros/speech_synthesis_library.h"
 
+using base::DoubleToString;
+
+const char kNameKey[] = "name";
+const char kLanguageNameKey[] = "languageName";
+const char kGenderKey[] = "gender";
+const char kRateKey[] = "rate";
+const char kPitchKey[] = "pitch";
+const char kVolumeKey[] = "volume";
+const char kEqualStr[] = "=";
+const char kDelimiter[] = ";";
+
 namespace {
   const char kCrosLibraryNotLoadedError[] =
       "Cros shared library not loaded.";
+
+  bool ReadNumberByKey(DictionaryValue* dict, const char* key,
+      double* ret_value) {
+    Value* value;
+    dict->Get(key, &value);
+    if (value->IsType(Value::TYPE_INTEGER)) {
+      int int_value;
+      if (!dict->GetInteger(key, &int_value))
+        return false;
+      *ret_value = int_value;
+    } else if (value->IsType(Value::TYPE_REAL)) {
+      if (!dict->GetReal(key, ret_value))
+        return false;
+    } else {
+      return false;
+    }
+    return true;
+  }
+
+  void AppendSpeakOption(std::string key, std::string value,
+      std::string* options) {
+    *options += key + kEqualStr + value + kDelimiter;
+  }
 };
 
 bool ExtensionTtsSpeakFunction::RunImpl() {
   std::string utterance;
+  std::string options = "";
+  DictionaryValue* speak_options = NULL;
   EXTENSION_FUNCTION_VALIDATE(args_->GetString(0, &utterance));
+  if (args_->GetDictionary(1, &speak_options)) {
+    std::string str_value;
+    double real_value;
+    if (speak_options->HasKey(kLanguageNameKey) &&
+        speak_options->GetString(kLanguageNameKey, &str_value)) {
+      AppendSpeakOption(std::string(kNameKey), str_value, &options);
+    }
+    if (speak_options->HasKey(kGenderKey) &&
+        speak_options->GetString(kGenderKey, &str_value)) {
+      AppendSpeakOption(std::string(kGenderKey), str_value, &options);
+    }
+    if (ReadNumberByKey(speak_options, kRateKey, &real_value))
+      // The TTS service allows a range of 0 to 5 for speech rate.
+      AppendSpeakOption(std::string(kRateKey),
+                        DoubleToString(real_value * 5), &options);
+    if (ReadNumberByKey(speak_options, kPitchKey, &real_value))
+      // The TTS service allows a range of 0 to 2 for speech pitch.
+      AppendSpeakOption(std::string(kPitchKey),
+                        DoubleToString(real_value * 2), &options);
+    if (ReadNumberByKey(speak_options, kVolumeKey, &real_value))
+      // The TTS service allows a range of 0 to 5 for speech volume.
+      AppendSpeakOption(std::string(kVolumeKey),
+                        DoubleToString(real_value * 5), &options);
+  }
   if (chromeos::CrosLibrary::Get()->EnsureLoaded()) {
+    if (!options.empty()) {
+      chromeos::CrosLibrary::Get()->GetSpeechSynthesisLibrary()->
+          SetSpeakProperties(options.c_str());
+    }
     bool ret = chromeos::CrosLibrary::Get()->GetSpeechSynthesisLibrary()->
         Speak(utterance.c_str());
     result_.reset();