Added the Vulkan Context Provider implementation.

cc/output/vulkan_in_process_context_provider.cc

Index: cc/output/vulkan_in_process_context_provider.cc
diff --git a/cc/output/vulkan_in_process_context_provider.cc b/cc/output/vulkan_in_process_context_provider.cc
index 0b67eb1a9807bc53f951a6148f5f2b39debaccb4..63ef105e513913d2151ddeeb0dbe891bdafe1224 100644
--- a/cc/output/vulkan_in_process_context_provider.cc
+++ b/cc/output/vulkan_in_process_context_provider.cc
@@ -7,6 +7,7 @@
 #include <vector>
 
 #include "gpu/vulkan/vulkan_device_queue.h"
+#include "gpu/vulkan/vulkan_surface.h"
 
 #if defined(VK_USE_PLATFORM_XLIB_KHR)
 #include "ui/gfx/x/x11_types.h"
@@ -16,6 +17,15 @@ namespace cc {
 
 scoped_refptr<VulkanInProcessContextProvider>
 VulkanInProcessContextProvider::Create() {
+  static bool vulkan_initialized = false;

[David Yen, 2016/04/16 01:32:38]

Not sure where the best place to call this is yet, this should be good enough
for now?

[piman, 2016/04/19 01:36:42]

BrowserMainLoop::BrowserThreadsStarted is probably the right place for it - next
to BrowserGpuChannelHostFactory::Initialize

[David Yen, 2016/04/19 22:20:28]

Done. I also just removed the InitializeOneOff() function from VulkanSurface, I
think just calling InitializeVulkan from vulkan_implementation should be good
enough. I also added a function to check whether or not the initialization
succeeded "gpu::VulkanSupported()" in vulkan_implementation.

[piman, 2016/04/19 23:42:02]

Yeah, it sounds better.

+  static bool vulkan_supported = false;
+  if (!vulkan_initialized) {
+    vulkan_initialized = true;
+    vulkan_supported = gpu::VulkanSurface::InitializeOneOff();
+  }
+  if (!vulkan_supported)
+    return nullptr;
+
   scoped_refptr<VulkanInProcessContextProvider> context_provider(
       new VulkanInProcessContextProvider);
   if (!context_provider->Initialize())
@@ -26,14 +36,19 @@ VulkanInProcessContextProvider::Create() {
 bool VulkanInProcessContextProvider::Initialize() {
   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;
+    return false;
   }
 
-  return false;
+  device_queue_ = std::move(device_queue);
+  return true;
+}
+
+void VulkanInProcessContextProvider::SwapBuffers() {
+  // Has no output surface attached to this.
+  NOTIMPLEMENTED();
 }
 
 void VulkanInProcessContextProvider::Destroy() {