Load CMA backend from shared library

chromecast/media/cma/backend/media_component_device.cc

-// Copyright 2014 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 "chromecast/media/cma/backend/media_component_device.h"
-
-#include "base/logging.h"
-
-namespace chromecast {
-namespace media {
-
-MediaComponentDevice::Client::Client() {
-}
-
-MediaComponentDevice::Client::~Client() {
-}
-
-MediaComponentDevice::MediaComponentDevice() {
-}
-
-MediaComponentDevice::~MediaComponentDevice() {
-}
-
-// static
-bool MediaComponentDevice::IsValidStateTransition(State state1, State state2) {
-  if (state2 == state1)
-    return true;
-
-  // All states can transition to |kStateError|.
-  bool is_transition_valid = (state2 == kStateError);
-
-  // All the other valid FSM transitions.
-  is_transition_valid = is_transition_valid ||
-      (state1 == kStateUninitialized && (state2 == kStateIdle)) ||
-      (state1 == kStateIdle && (state2 == kStateRunning ||
-                                state2 == kStatePaused ||
-                                state2 == kStateUninitialized)) ||
-      (state1 == kStatePaused && (state2 == kStateIdle ||
-                                  state2 == kStateRunning)) ||
-      (state1 == kStateRunning && (state2 == kStateIdle ||
-                                   state2 == kStatePaused)) ||
-      (state1 == kStateError && (state2 == kStateUninitialized));
-
-  return is_transition_valid;
-}
-
-// static
-std::string MediaComponentDevice::StateToString(const State& state) {
-  switch (state) {
-    case kStateUninitialized:
-      return "Uninitialized";
-    case kStateIdle:
-      return "Idle";
-    case kStateRunning:
-      return "Running";
-    case kStatePaused:
-      return "Paused";
-    case kStateError:
-      return "Error";
-    default:
-      NOTREACHED() << "Unknown MediaComponentDevice::State: " << state;
-      return "";
-  }
-}
-
-}  // namespace media
-}  // namespace chromecast