Add a new parameter |latency| to PPB_Audio.

ppapi/cpp/audio.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ppapi/cpp/audio.h"
 
 #include "ppapi/cpp/instance_handle.h"
 #include "ppapi/cpp/module_impl.h"
 
 namespace pp {
 
 namespace {
 
 template <> const char* interface_name<PPB_Audio_1_0>() {
   return PPB_AUDIO_INTERFACE_1_0;
 }
 
+template <> const char* interface_name<PPB_Audio_1_1>() {
+  return PPB_AUDIO_INTERFACE_1_1;
+}
+
 }  // namespace
 
 Audio::Audio(const InstanceHandle& instance,
              const AudioConfig& config,
              PPB_Audio_Callback callback,
              void* user_data)
-    : config_(config) {
+    : config_(config),
+      use_1_0_interface_(false) {
+  if (has_interface<PPB_Audio_1_1>()) {
+    PassRefFromConstructor(get_interface<PPB_Audio_1_1>()->Create(
+        instance.pp_instance(), config.pp_resource(), callback, user_data));
+  }
+}
+
+Audio::Audio(const InstanceHandle& instance,
+             const AudioConfig& config,
+             PPB_Audio_Callback_1_0 callback,
+             void* user_data)
+    : config_(config),
+      use_1_0_interface_(true) {
   if (has_interface<PPB_Audio_1_0>()) {
     PassRefFromConstructor(get_interface<PPB_Audio_1_0>()->Create(
         instance.pp_instance(), config.pp_resource(), callback, user_data));
   }
 }
 
 bool Audio::StartPlayback() {
-  return has_interface<PPB_Audio_1_0>() &&
-      get_interface<PPB_Audio_1_0>()->StartPlayback(pp_resource());
+  if (has_interface<PPB_Audio_1_1>() && !use_1_0_interface_) {
+    return PP_ToBool(get_interface<PPB_Audio_1_1>()->StartPlayback(
+        pp_resource()));
+  }
+  if (has_interface<PPB_Audio_1_0>()) {
+    return PP_ToBool(get_interface<PPB_Audio_1_0>()->StartPlayback(
+        pp_resource()));
+  }
+  return false;
 }
 
 bool Audio::StopPlayback() {
-  return has_interface<PPB_Audio_1_0>() &&
-      get_interface<PPB_Audio_1_0>()->StopPlayback(pp_resource());
+  if (has_interface<PPB_Audio_1_1>() && !use_1_0_interface_) {
+    return PP_ToBool(get_interface<PPB_Audio_1_1>()->StopPlayback(
+        pp_resource()));
+  }
+  if (has_interface<PPB_Audio_1_0>()) {
+    return PP_ToBool(get_interface<PPB_Audio_1_0>()->StopPlayback(
+        pp_resource()));
+  }
+  return false;
 }
 
 }  // namespace pp