Added the Vulkan Context Provider implementation.

cc/output/vulkan_in_process_context_provider.cc

 // Copyright (c) 2016 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 "cc/output/vulkan_in_process_context_provider.h"
 
-#include <vector>
-
+#if defined(ENABLE_VULKAN)
 #include "gpu/vulkan/vulkan_device_queue.h"
-
-#if defined(VK_USE_PLATFORM_XLIB_KHR)
-#include "ui/gfx/x/x11_types.h"
-#endif  // defined(VK_USE_PLATFORM_XLIB_KHR)
+#include "gpu/vulkan/vulkan_implementation.h"
+#endif  // defined(ENABLE_VULKAN)
 
 namespace cc {
 
 scoped_refptr<VulkanInProcessContextProvider>
 VulkanInProcessContextProvider::Create() {
+#if defined(ENABLE_VULKAN)
+  if (!gpu::VulkanSupported())
+    return nullptr;
+
   scoped_refptr<VulkanInProcessContextProvider> context_provider(
       new VulkanInProcessContextProvider);
   if (!context_provider->Initialize())
     return nullptr;
   return context_provider;
+#else
+  return nullptr;
+#endif
 }
 
 bool VulkanInProcessContextProvider::Initialize() {
+#if defined(ENABLE_VULKAN)
+  DCHECK(!device_queue_);
   std::unique_ptr<gpu::VulkanDeviceQueue> device_queue(
       new gpu::VulkanDeviceQueue);
-  if (device_queue->Initialize(
+  if (!device_queue->Initialize(
           gpu::VulkanDeviceQueue::GRAPHICS_QUEUE_FLAG |
           gpu::VulkanDeviceQueue::PRESENTATION_SUPPORT_QUEUE_FLAG)) {
-    device_queue_ = std::move(device_queue);
-    return true;
+    device_queue->Destroy();
+    return false;
   }
 
+  device_queue_ = std::move(device_queue);
+  return true;
+#else
   return false;
+#endif
 }
 
 void VulkanInProcessContextProvider::Destroy() {
+#if defined(ENABLE_VULKAN)
   if (device_queue_) {
     device_queue_->Destroy();
     device_queue_.reset();
   }
+#endif
 }
 
 gpu::VulkanDeviceQueue* VulkanInProcessContextProvider::GetDeviceQueue() {
+#if defined(ENABLE_VULKAN)
   return device_queue_.get();
+#else
+  return nullptr;
+#endif
 }
 
 VulkanInProcessContextProvider::VulkanInProcessContextProvider() {}
 
 VulkanInProcessContextProvider::~VulkanInProcessContextProvider() {}
 
 }  // namespace cc