Add workaround for Adreno copyImageToBuffer calls on Vulkan

src/gpu/vk/GrVkCaps.h

Index: src/gpu/vk/GrVkCaps.h
diff --git a/src/gpu/vk/GrVkCaps.h b/src/gpu/vk/GrVkCaps.h
index 3733f2c1d6427927f11496cb974cf66aefec02b3..f1ab8d050acf8052c1a26edacb4872872220c892 100644
--- a/src/gpu/vk/GrVkCaps.h
+++ b/src/gpu/vk/GrVkCaps.h
@@ -62,6 +62,10 @@ public:
         return fCanUseGLSLForShaderModule;
     }
 
+    bool mustDoCopiesFromOrigin() const {
+        return fMustDoCopiesFromOrigin;
+    }
+
     /**
      * Returns both a supported and most prefered stencil format to use in draws.
      */
@@ -72,6 +76,10 @@ public:
     GrGLSLCaps* glslCaps() const { return reinterpret_cast<GrGLSLCaps*>(fShaderCaps.get()); }
 
 private:
+    enum VkVendor {
+        kQualcomm_VkVendor = 20803,
+    };
+
     void init(const GrContextOptions& contextOptions, const GrVkInterface* vkInterface,
               VkPhysicalDevice device, uint32_t featureFlags, uint32_t extensionFlags);
     void initGrCaps(const VkPhysicalDeviceProperties&,
@@ -107,6 +115,10 @@ private:
     // Tells of if we can pass in straight GLSL string into vkCreateShaderModule
     bool fCanUseGLSLForShaderModule;
 
+    // On Adreno vulkan, they do not respect the imageOffset parameter at least in
+    // copyImageToBuffer. This flag says that we must do the copy starting from the origin always.
+    bool fMustDoCopiesFromOrigin;
+
     typedef GrCaps INHERITED;
 };