Fix crash when VulkanSurface is no longer valid

SkiaVulkanPipeline::mVkSurface can become obsolete if
RenderThread destroys Vulkan context. This CL enables
RenderThread to notify active Vulkan pipelines that their
surface is invalid.
Improve error handling, when trying to draw a frame with null
VulkanSurface.

Bug: 123640274
Bug: 123541940
Test: Ran several apps
Change-Id: If7fba00713d097192c96179df36e90b54f4f8090