Prevent drag-and-drop events from firing over cross-site, same-page frames.

Prevent drag-and-drop events from firing over cross-site, same-page frames.

This is done by storing the source RenderViewHost and RenderProcessHost for each dragstart. Then, for other drag events (like dragover), if the target frame for that event is in the same RenderViewHost, but different RenderProcessHost, than the source, then the event is not fired.

Note that this patch will not affect behavior on Mac, and a subsequent CL will enforce the same thing for Mac.

BUG=666858
Review-Url: https://codereview.chromium.org/2568893002
Cr-Commit-Position: refs/heads/master@{#438609}
(cherry picked from commit 7dfa247951db2ccb10b8b5276eb58a33cda4728f)

Committed: https://chromium.googlesource.com/chromium/src/+/13b936546c5148df17caa25ee744d94307ff9e94

[paulmeyer, 2016-12-19 20:36:33]

Description was changed from

==========
Prevent drag-and-drop events from firing over cross-site, same-page frames.

This is done by storing the source RenderViewHost and RenderProcessHost for each
dragstart. Then, for other drag events (like dragover), if the target frame for
that event is in the same RenderViewHost, but different RenderProcessHost, than
the source, then the event is not fired.

Note that this patch will not affect behavior on Mac, and a subsequent CL will
enforce the same thing for Mac.

BUG=666858

Review-Url: https://codereview.chromium.org/2568893002
Cr-Commit-Position: refs/heads/master@{#438609}
(cherry picked from commit 7dfa247951db2ccb10b8b5276eb58a33cda4728f)
==========

to

==========
Prevent drag-and-drop events from firing over cross-site, same-page frames.

This is done by storing the source RenderViewHost and RenderProcessHost for each
dragstart. Then, for other drag events (like dragover), if the target frame for
that event is in the same RenderViewHost, but different RenderProcessHost, than
the source, then the event is not fired.

Note that this patch will not affect behavior on Mac, and a subsequent CL will
enforce the same thing for Mac.

BUG=666858

Review-Url: https://codereview.chromium.org/2568893002
Cr-Commit-Position: refs/heads/master@{#438609}
(cherry picked from commit 7dfa247951db2ccb10b8b5276eb58a33cda4728f)

Committed:
https://chromium.googlesource.com/chromium/src/+/13b936546c5148df17caa25ee744...
==========

[paulmeyer, 2016-12-19 20:36:36]

Committed patchset #1 (id:1) manually as
13b936546c5148df17caa25ee744d94307ff9e94.