Add workaround for Adreno copyImageToBuffer calls on Vulkan

src/gpu/vk/GrVkCaps.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrVkCaps_DEFINED
 #define GrVkCaps_DEFINED
 
@@ skipping 44 matching lines @@
     bool configCanBeSrcofBlit(GrPixelConfig config, bool linearTiled) const {
         const uint16_t& flags = linearTiled ? fConfigTable[config].fLinearFlags :
                                               fConfigTable[config].fOptimalFlags;
         return SkToBool(ConfigInfo::kBlitSrc_Flag & flags);
     }
 
     bool canUseGLSLForShaderModule() const {
         return fCanUseGLSLForShaderModule;
     }
 
+    bool mustDoCopiesFromOrigin() const {
+        return fMustDoCopiesFromOrigin;
+    }
+
     /**
      * Returns both a supported and most prefered stencil format to use in draws.
      */
     const StencilFormat& preferedStencilFormat() const {
         return fPreferedStencilFormat;
     }
 
     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&,
                     const VkPhysicalDeviceMemoryProperties&,
                     uint32_t featureFlags);
     void initGLSLCaps(const VkPhysicalDeviceProperties&, uint32_t featureFlags);
     void initSampleCount(const VkPhysicalDeviceProperties& properties);
 
 
     void initConfigTable(const GrVkInterface*, VkPhysicalDevice);
@@ skipping 15 matching lines @@
         uint16_t fOptimalFlags;
         uint16_t fLinearFlags;
     };
     ConfigInfo fConfigTable[kGrPixelConfigCnt];
 
     StencilFormat fPreferedStencilFormat;
 
     // 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;
 };
 
 #endif