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When referring to Android surface objects, use a JavaRef instead of a
bare jobject, to make sure we manage reference lifetimes correctly.

This changes the following interfaces:
- ScopedJavaSurface::AcquireExternalSurface
- GpuSurfaceTracker::SurfaceRecord::SurfaceRecord
- Compositor::SetSurface

Most of the callers of these functions already had JavaParamRef objects
and were relying on the implicit conversion to jobject, which is no
longer necessary with this change; the remaining callers have been
updated.

Change-Id: Ic667ad98974bbe8b0674afbce3c0eb6072001468
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2453270Reviewed-by: Shimi Zhang <ctzsm@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815150}