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Fixes the following issues: 1. When a surface is set, it's expected that the renderer will notify video size + when a frame is rendered to it. This is true even if the surface isn't changing. Right now this is achieved by setting renderedFirstFrame to false, but this is problematic in the case that the surface isn't changing because (a) it will force rendering of a subsequent frame to the output even when paused, which is incorrect, and (b) isReady will return false until this occurs. 2. When the surface really is changing, isReady can return false until the first frame has been rendered into the new surface, which will break seamless surface switching. This change allows isReady to return true up to allowedJoiningTimeMs for this case. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=154171111