Added the Vulkan Context Provider implementation.

content/browser/compositor/browser_compositor_output_surface.h

Index: content/browser/compositor/browser_compositor_output_surface.h
diff --git a/content/browser/compositor/browser_compositor_output_surface.h b/content/browser/compositor/browser_compositor_output_surface.h
index 02f284c18339d80b6a812d6fa0806f774bd4d25c..db0993f97cd4518c2b22e17cd85125451f4dc3bb 100644
--- a/content/browser/compositor/browser_compositor_output_surface.h
+++ b/content/browser/compositor/browser_compositor_output_surface.h
@@ -12,6 +12,7 @@
 #include "cc/scheduler/begin_frame_source.h"
 #include "content/common/content_export.h"
 #include "ui/compositor/compositor_vsync_manager.h"
+#include "ui/gfx/native_widget_types.h"
 
 namespace cc {
 class SoftwareOutputDevice;
@@ -79,6 +80,13 @@ class CONTENT_EXPORT BrowserCompositorOutputSurface
       const scoped_refptr<ui::CompositorVSyncManager>& vsync_manager,
       base::SingleThreadTaskRunner* task_runner);
 
+#if defined(ENABLE_VULKAN)

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

ditto, works without ifdef?

+  // Constructor used by the Vulkan implementation.
+  BrowserCompositorOutputSurface(
+      const scoped_refptr<cc::VulkanContextProvider>& vulkan_context_provider,
+      const scoped_refptr<ui::CompositorVSyncManager>& vsync_manager);
+#endif
+
   scoped_refptr<ui::CompositorVSyncManager> vsync_manager_;
   std::unique_ptr<cc::SyntheticBeginFrameSource> synthetic_begin_frame_source_;
   ReflectorImpl* reflector_;