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To support ANGLE, we need to create ANGLE context and surfaces from the
native EGL context and surfaces with the
EGL_ANGLE_external_context_and_surface extension. And ANGLE will save
and restore during make current or release the current context with
eglMakeCurrent() call. To do that, ScopedAppGLStateRestore will not
create gl::GLContext, save and restore GL state anymore. It only queries
stencil state with native GL binding instead of the ANGLE GL binding,
since ANGLE will not return the GL state from the native GL.
And SkiaRenderer may need the stencil state later. The ANGLE EGL context
will be created in OutputSurfaceProviderWebView, and make current in
HardwareRendererViz.

Bug: 1157501
Change-Id: Ieca9c85855df5ab529846fe2882d7451f50f51bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2612925
Commit-Queue: Peng Huang <penghuang@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846201}