Invalidate Skia shader cache if Vulkan driver has changed

Test: Ran apps several time and observed shader cache validation
Change-Id: I7c2620b9a0eefcb7acedc86647ecf44805518b2f

libs/hwui/renderthread/RenderThread.cpp

@@ -209,8 +209,8 @@ void RenderThread::requireVkContext() {
     mVkManager->initialize();
     GrContextOptions options;
     initGrContextOptions(options);
-    // TODO: get a string describing the SPIR-V compiler version and use it here
-    cacheManager().configureContext(&options, nullptr, 0);
+    auto vkDriverVersion = mVkManager->getDriverVersion();
+    cacheManager().configureContext(&options, &vkDriverVersion, sizeof(vkDriverVersion));
     sk_sp<GrContext> grContext = mVkManager->createContext(options);
     LOG_ALWAYS_FATAL_IF(!grContext.get());
     setGrContext(grContext);

libs/hwui/renderthread/VulkanManager.cpp

@@ -170,6 +170,7 @@ void VulkanManager::setupDevice(GrVkExtensions& grExtensions, VkPhysicalDeviceFe
     VkPhysicalDeviceProperties physDeviceProperties;
     mGetPhysicalDeviceProperties(mPhysicalDevice, &physDeviceProperties);
     LOG_ALWAYS_FATAL_IF(physDeviceProperties.apiVersion < VK_MAKE_VERSION(1, 1, 0));
+    mDriverVersion = physDeviceProperties.driverVersion;
 
     // query to get the initial queue props size
     uint32_t queueCount;

libs/hwui/renderthread/VulkanManager.h

@@ -82,6 +82,8 @@ public:
 
     sk_sp<GrContext> createContext(const GrContextOptions& options);
 
+    uint32_t getDriverVersion() const { return mDriverVersion; }
+
 private:
     friend class VulkanSurface;
     // Sets up the VkInstance and VkDevice objects. Also fills out the passed in
@@ -178,6 +180,7 @@ private:
     };
     SwapBehavior mSwapBehavior = SwapBehavior::Discard;
     GrVkExtensions mExtensions;
+    uint32_t mDriverVersion = 0;
 };
 
 } /* namespace renderthread */