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Add methods mouse capture methods to the BridgedNativeWidgetPublic
interface that BridgedNativeWidget implements.

Have BridgedNativeWidget pass the mouse capture status to
BridgedNativeWidgetHostImpl, which the NativeWidgetMac will access.

Add NativeWidgetMac::GetBridgeHostImplForNativeWindow method for
unittests, and merge the implementations of GetBridgeForNativeWindow,
GetBridgeHostImplForNativeWindow, and GetNativeWidgetForNativeWindow.

Bug: 859152
Change-Id: I25af661ad487b4f5a89bb02b1c655fb0ab27b8fb
Reviewed-on: https://chromium-review.googlesource.com/1186161Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586392}