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RenderWidgetHostViews can become "inactive", and then "active" again.
This can happen if the origin of a RWHV is still kept alive by another
active RWHV, after the RWHV becomes inactive. Then the inactive RWHV
can become active again if its WebContents navigates back to the
matching origin.

RWHVA destroys SynchronousCompositorHost when it becomes inactive in
UpdateNativeViewTree. However it does not recreate it when RWHVA is
active again later, breaking rendering in Android WebView. Fix this
and also clean up by de-duplicating code to create and destroy
SynchronousCompositorHost.

Bug: 1039586
Change-Id: I7772c9d341f44f5c822f3ac186be236e5d6abf02
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1995841
Commit-Queue: Bo <boliu@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732558}