Created attachment 655067 [details] example of the problem Sometimes when rotating the phone on the WebGL FPS test  white tiles will be shown in portrait mode. Once in this problem other issues start appearing such as a non-changing color band on the right side of the display. Phone is a Galaxy SIII with a mali-400 gpu using the current nightly  http://webglsamples.googlecode.com/hg/fpstest/fpstest.html
Summary: WebGL FPS test has tile invalidation issues when rotating → WebGL FPS test has display corruption issues when rotating
Adding bjacob since this is webgl-related.
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