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This change implements RemoteObjectInjector#renderFrameCreated to inject
all requested objects into a newly created frame. To get the
RenderFrameHost from render process id and frame id,
a new WebContents JNI method is exposed.

Bug: 1105935,1107555
Change-Id: I3b9119deb64c75550f41a4aeab81ced245613a29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2337498Reviewed-by: Shimi Zhang <ctzsm@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797050}