Ensure RemoteViewportIntersection rect persists across frame navigations

Ensure RemoteViewportIntersection rect persists across frame navigations

To prevent excessive IPC messages, a parent frame of an OOPIF only
updates its remote viewport intersection rect when the intersection
changes. However, a frame can navigate without the parent frame being
aware of it, in which case the rect is lost without being resent.

To address that problem, this CL caches the rect on
CrossProcessFrameConnector in the browser process, and sends it to the
renderer whenever RenderWidgetHostImpl::SendScreenRects() is called.

This CL also moves the rect's storage in Blink from LocalFrameView to
LocalFrame so that it persists across same-process navigations.

BUG=720342
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation

Review-Url: https://codereview.chromium.org/2910023002
Cr-Original-Commit-Position: refs/heads/master@{#475756}
Review-Url: https://codereview.chromium.org/2919903003 .
Cr-Commit-Position: refs/branch-heads/3112@{#119}
Cr-Branched-From: b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
Committed: https://chromium.googlesource.com/chromium/src/+/3978c4d1047d5a2559a6b85de3804790872e35d9

[kenrb, 2017-06-02 16:24:13]

Description was changed from

==========
Ensure RemoteViewportIntersection rect persists across frame navigations

To prevent excessive IPC messages, a parent frame of an OOPIF only
updates its remote viewport intersection rect when the intersection
changes. However, a frame can navigate without the parent frame being
aware of it, in which case the rect is lost without being resent.

To address that problem, this CL caches the rect on
CrossProcessFrameConnector in the browser process, and sends it to the
renderer whenever RenderWidgetHostImpl::SendScreenRects() is called.

This CL also moves the rect's storage in Blink from LocalFrameView to
LocalFrame so that it persists across same-process navigations.

BUG=720342
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation

Review-Url: https://codereview.chromium.org/2910023002
Cr-Commit-Position: refs/heads/master@{#475756}
(cherry picked from commit 1e68f60e90fc7b0b12bbf884291458e5e4aa3b2f)
==========

to

==========
Ensure RemoteViewportIntersection rect persists across frame navigations

To prevent excessive IPC messages, a parent frame of an OOPIF only
updates its remote viewport intersection rect when the intersection
changes. However, a frame can navigate without the parent frame being
aware of it, in which case the rect is lost without being resent.

To address that problem, this CL caches the rect on
CrossProcessFrameConnector in the browser process, and sends it to the
renderer whenever RenderWidgetHostImpl::SendScreenRects() is called.

This CL also moves the rect's storage in Blink from LocalFrameView to
LocalFrame so that it persists across same-process navigations.

BUG=720342
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation

Review-Url: https://codereview.chromium.org/2910023002
Cr-Original-Commit-Position: refs/heads/master@{#475756}
Review-Url: https://codereview.chromium.org/2919903003 .
Cr-Commit-Position: refs/branch-heads/3112@{#119}
Cr-Branched-From:
b6460e24cf59f429d69de255538d0fc7a425ccf9-refs/heads/master@{#474897}
Committed:
https://chromium.googlesource.com/chromium/src/+/3978c4d1047d5a2559a6b85de380...
==========

[kenrb, 2017-06-02 16:24:14]

Committed patchset #1 (id:1) manually as
3978c4d1047d5a2559a6b85de3804790872e35d9.