Decouple VulkanManager from RenderThread

This CL allows for more than one VulkanManager to exist.
VulkanManager ctor are public allowing for classes other
than RenderThread to instantiate it.
Secondary VulkanManager can be used to render on a thread
other than RT.

Test: Ran HWUI unit tests and several apps
Change-Id: Ibfd76c86ff67e01617a500902bba7431b928f5c0
diff --git a/libs/hwui/renderthread/VulkanManager.h b/libs/hwui/renderthread/VulkanManager.h
index 1fe6c65..9763686 100644
--- a/libs/hwui/renderthread/VulkanManager.h
+++ b/libs/hwui/renderthread/VulkanManager.h
@@ -22,6 +22,8 @@
 #endif
 #include <vulkan/vulkan.h>
 
+#include <GrContextOptions.h>
+#include <vk/GrVkExtensions.h>
 #include <SkSurface.h>
 #include <ui/Fence.h>
 #include <utils/StrongPointer.h>
@@ -39,9 +41,9 @@
 class VulkanSurface {
 public:
     VulkanSurface(ColorMode colorMode, ANativeWindow* window, sk_sp<SkColorSpace> colorSpace,
-                  SkColorType colorType)
+                  SkColorType colorType, GrContext* grContext)
             : mColorMode(colorMode), mNativeWindow(window), mColorSpace(colorSpace),
-              mColorType(colorType) {}
+              mColorType(colorType), mGrContext(grContext) {}
 
     sk_sp<SkSurface> getBackBufferSurface() { return mBackbuffer; }
 
@@ -93,6 +95,7 @@
     SkColorType mColorType;
     VkSurfaceTransformFlagBitsKHR mTransform = VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR;
     SkMatrix mPreTransform;
+    GrContext* mGrContext;
 };
 
 // This class contains the shared global Vulkan objects, such as VkInstance, VkDevice and VkQueue,
@@ -100,6 +103,9 @@
 // windowing contexts. The VulkanManager must be initialized before use.
 class VulkanManager {
 public:
+    explicit VulkanManager() {}
+    ~VulkanManager() { destroy(); }
+
     // Sets up the vulkan context that is shared amonst all clients of the VulkanManager. This must
     // be call once before use of the VulkanManager. Multiple calls after the first will simiply
     // return.
@@ -112,7 +118,8 @@
     // VulkanSurface object which is returned.
     VulkanSurface* createSurface(ANativeWindow* window, ColorMode colorMode,
                                  sk_sp<SkColorSpace> surfaceColorSpace,
-                                 SkColorType surfaceColorType);
+                                 SkColorType surfaceColorType,
+                                 GrContext* grContext);
 
     // Destroy the VulkanSurface and all associated vulkan objects.
     void destroySurface(VulkanSurface* surface);
@@ -143,12 +150,9 @@
     // Returned pointers are owned by VulkanManager.
     VkFunctorInitParams getVkFunctorInitParams() const;
 
+    sk_sp<GrContext> createContext(GrContextOptions options);
+
 private:
-    friend class RenderThread;
-
-    explicit VulkanManager(RenderThread& thread);
-    ~VulkanManager() { destroy(); }
-
     // Sets up the VkInstance and VkDevice objects. Also fills out the passed in
     // VkPhysicalDeviceFeatures struct.
     void setupDevice(GrVkExtensions&, VkPhysicalDeviceFeatures2&);
@@ -231,8 +235,6 @@
     VkPtr<PFN_vkWaitForFences> mWaitForFences;
     VkPtr<PFN_vkResetFences> mResetFences;
 
-    RenderThread& mRenderThread;
-
     VkInstance mInstance = VK_NULL_HANDLE;
     VkPhysicalDevice mPhysicalDevice = VK_NULL_HANDLE;
     VkDevice mDevice = VK_NULL_HANDLE;
@@ -256,6 +258,7 @@
         BufferAge,
     };
     SwapBehavior mSwapBehavior = SwapBehavior::Discard;
+    GrVkExtensions mExtensions;
 };
 
 } /* namespace renderthread */