qq: Could this cause problems when we have to merge back some more changes this week? If so, I'd vote for postponing this refactoring by a few days :-)

Good point, I have the lgtm but I can wait a bit :)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4d4ff5f9774061cd48d7941596e2c58cd1b5dbe1

commit 4d4ff5f9774061cd48d7941596e2c58cd1b5dbe1
Author: wjmaclean <wjmaclean@chromium.org>
Date: Thu Nov 03 16:59:09 2016

Pass min/max page scale to compositor from WebFrameWidget.

Remove a FIXME by plumbing the min/max page scale factor from the
WebView into the WebFrameWidget's layerTreeView.

This CL is in preparation for plumbing the page scale into the
layer tree for subframes, in order that the raster scale can be
set properly. The page scale for subframes should remain a 1.f.

BUG= 645917 

Review-Url: https://codereview.chromium.org/2472133002
Cr-Commit-Position: refs/heads/master@{#429624}

[modify] https://crrev.com/4d4ff5f9774061cd48d7941596e2c58cd1b5dbe1/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2a6cab73e4df91520c0cbcaacd9ee861dae7805b

commit 2a6cab73e4df91520c0cbcaacd9ee861dae7805b
Author: wjmaclean <wjmaclean@chromium.org>
Date: Thu Nov 03 18:36:40 2016

RenderFrameImpl doesn't need a WeakPtr to RenderViewImpl.

In preparation for moving the WeakPtr support from RenderViewImpl to
RenderWidget, we change the pointer held by RenderFrameImpl to be a
raw pointer instead of a WeakPtr. Since the RenderView should always
outlive the RenderFrame, this is safe to do.

BUG= 645917 

Review-Url: https://codereview.chromium.org/2468423003
Cr-Commit-Position: refs/heads/master@{#429657}

[modify] https://crrev.com/2a6cab73e4df91520c0cbcaacd9ee861dae7805b/content/renderer/render_frame_impl.cc
[modify] https://crrev.com/2a6cab73e4df91520c0cbcaacd9ee861dae7805b/content/renderer/render_frame_impl.h

The above two CLs were linked to the wrong bug, +wjmaclean FYI.

This was blocked by 671979. This is now cleared, so I get to it when I find some time for cleaning up (probably not before M57 FF).

Done for all important parameters.