Vulkan: More perf warnings

src/libANGLE/renderer/vulkan/TextureVk.cpp

@@ -414,6 +414,10 @@ angle::Result TextureVk::setSubImageImpl(const gl::Context *context,
         }
         else
         {
+            ANGLE_PERF_WARNING(contextVk->getDebug(), GL_DEBUG_SEVERITY_HIGH,
+                               "TexSubImage with unpack buffer copied on CPU due to store, format "
+                               "or offset restrictions");
+
             void *mapPtr = nullptr;
 
             ANGLE_TRY(unpackBufferVk->mapImpl(contextVk, &mapPtr));

src/libANGLE/renderer/vulkan/vk_helpers.cpp

@@ -5051,6 +5051,9 @@ angle::Result ImageHelper::readPixels(ContextVk *contextVk,
     commandBuffer.copyImageToBuffer(src->getImage(), src->getCurrentLayout(), bufferHandle, 1,
                                     &region);
 
+    ANGLE_PERF_WARNING(contextVk->getDebug(), GL_DEBUG_SEVERITY_HIGH,
+                       "GPU stall due to ReadPixels");
+
     // Triggers a full finish.
     // TODO(jmadill): Don't block on asynchronous readback.
     ANGLE_TRY(contextVk->finishImpl());