Added the Vulkan Context Provider implementation.

cc/output/vulkan_context_provider.h

Index: cc/output/vulkan_context_provider.h
diff --git a/cc/output/vulkan_context_provider.h b/cc/output/vulkan_context_provider.h
index 6b50128cdaabc30abf4a094723335da09fc15a4e..f3d6be0b9864d756799b95833764ad56ab16fe82 100644
--- a/cc/output/vulkan_context_provider.h
+++ b/cc/output/vulkan_context_provider.h
@@ -6,6 +6,7 @@
 #define CC_OUTPUT_VULKAN_CONTEXT_PROVIDER_H_
 
 #include "base/memory/ref_counted.h"
+#include "cc/base/cc_export.h"
 
 namespace gpu {
 class VulkanDeviceQueue;
@@ -14,7 +15,7 @@ class VulkanDeviceQueue;
 namespace cc {
 
 // The VulkanContextProvider groups sharing of vulkan objects synchronously.
-class VulkanContextProvider
+class CC_EXPORT VulkanContextProvider
     : public base::RefCountedThreadSafe<VulkanContextProvider> {
  public:
   virtual gpu::VulkanDeviceQueue* GetDeviceQueue() = 0;