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This regressed with the LegacyRenderWidgetHostHWND. It looks like the reason is that the LegacyRenderWidgetHostHWND eats
paint messages which would previously cause an invalidation in the parent when bounds change, etc.

Proposed fix is to pass SWP_NOREDRAW to the SetWindowPos calls used by the LegacyRenderWidgetHostHWND class.

BUG=388690
R=sky

Review URL: https://codereview.chromium.org/440793002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287994 0039d316-1c4b-4281-b951-d872f2087c98