Added initial implementation of Vulkan Render Passes.

content/common/gpu/gpu_command_buffer_stub.h

Index: content/common/gpu/gpu_command_buffer_stub.h
diff --git a/content/common/gpu/gpu_command_buffer_stub.h b/content/common/gpu/gpu_command_buffer_stub.h
index e20388717304d1dbd9fa84780a07431e22a5661a..4d3437ab7677126f8f52e3ef2b0a4326ff07d61d 100644
--- a/content/common/gpu/gpu_command_buffer_stub.h
+++ b/content/common/gpu/gpu_command_buffer_stub.h
@@ -36,6 +36,12 @@
 #include "ui/gl/gpu_preference.h"
 #include "url/gurl.h"
 
+namespace gfx {
+#if defined(ENABLE_VULKAN)
+class VulkanSurface;
+#endif
+}
+
 namespace gpu {
 struct Mailbox;
 struct SyncToken;
@@ -259,6 +265,9 @@ class GpuCommandBufferStub
   scoped_ptr<gpu::GpuScheduler> scheduler_;
   scoped_ptr<gpu::SyncPointClient> sync_point_client_;
   scoped_refptr<gfx::GLSurface> surface_;
+#if defined(ENABLE_VULKAN)
+  scoped_ptr<gfx::VulkanSurface> vk_surface_;
+#endif

[piman, 2016/03/09 01:25:33]

I don't think we should be touching GpuCommandBufferStub. In the Vulkan world,
we wouldn't be using GpuCommandBufferStubs, nor the GPU process in the way we do
with GL - if at all. Instead, we should have the OutputSurface directly connect
to the VulkanSurface.

[David Yen, 2016/03/10 01:39:48]

Still working on this, just fixed everything else for you to review first.

[David Yen, 2016/03/11 01:01:16]

This has been reverted and tested through the vulkan_tests instead. This should
eventually be done through OutputSurface with VulkanContextProvider.

   gfx::GLSurface::Format surface_format_;
 
   GpuWatchdog* watchdog_;