Vulkan: Reset swap chain image dependency information when aquiring.

src/libANGLE/renderer/vulkan/CommandGraph.cpp

@@ -182,6 +182,13 @@ bool CommandGraphResource::isResourceInUse(RendererVk *renderer) const
     return renderer->isSerialInUse(mStoredQueueSerial);
 }
 
+void CommandGraphResource::resetQueueSerial()
+{
+    mCurrentWritingNode = nullptr;
+    mCurrentReadingNodes.clear();
+    mStoredQueueSerial = Serial();
+}
+
 angle::Result CommandGraphResource::recordCommands(Context *context,
                                                    CommandBuffer **commandBufferOut)
 {

src/libANGLE/renderer/vulkan/CommandGraph.h

@@ -277,6 +277,10 @@ class CommandGraphResource : angle::NonCopyable
         }
     }
 
+    // Reset the current queue serial for this resource. Will clear dependencies if the resource
+    // was not used in this set of command nodes.
+    void resetQueueSerial();
+
     // Allocates a write node via getNewWriteNode and returns a started command buffer.
     // The started command buffer will render outside of a RenderPass.
     // Will append to an existing command buffer/graph node if possible.

src/libANGLE/renderer/vulkan/SurfaceVk.cpp

@@ -837,6 +837,17 @@ angle::Result WindowSurfaceVk::nextSwapchainImage(DisplayVk *displayVk)
 
     SwapchainImage &image = mSwapchainImages[mCurrentSwapchainImageIndex];
 
+    // This swap chain image is new, reset any dependency information it has.
+    //
+    // When the Vulkan backend is multithreading, different contexts can have very different current
+    // serials.  If a surface is rendered to by multiple contexts in different frames, the last
+    // context to write a particular swap chain image has no bearing on the current context writing
+    // to that image.
+    //
+    // Clear the image's queue serial because it's possible that it appears to be in the future to
+    // the next context that writes to the image.
+    image.image.resetQueueSerial();
+
     // Update RenderTarget pointers.
     mColorRenderTarget.updateSwapchainImage(&image.image, &image.imageView);