Store the callstack of the IPC sender of ViewMsg_New.

Store the callstack of the IPC sender of ViewMsg_New.

This is a temporary change to help track down the bug below, where we try to create a second RenderView with the same routing id in the same process.
This CL fixes the previous CL where some of the data got optimized out by the compiler.

BUG=464633
Committed: https://crrev.com/f032c0d065a5387a2e490e45bbec046e5a1bda61
Cr-Commit-Position: refs/heads/master@{#321024}

[lfg, 2015-03-17 22:24:21]

lfg@chromium.org changed reviewers:
+ nasko@chromium.org

[lfg, 2015-03-17 22:24:22]

Hi Nasko, please take a look.

[nasko, 2015-03-17 22:45:20]

Was the debug::Alias() call not enough for the compiler to not optimize out the
code? I'm just curious, as it is useful knowledge to have/document.

LGTM with a nit.

https://codereview.chromium.org/1006003005/diff/1/content/renderer/render_fra...
File content/renderer/render_frame_impl.cc (right):

https://codereview.chromium.org/1006003005/diff/1/content/renderer/render_fra...
content/renderer/render_frame_impl.cc:698: for (int i = 0; i < size; i++)
nit: I'd add a comment above to explain why this seemingly unneeded work is
being performed. I know it is temporary code, but it is good to have for the few
people that might see it before we revert it.

[lfg, 2015-03-17 23:50:12]

The CQ bit was checked by lfg@chromium.org

[lfg, 2015-03-17 23:50:12]

The patchset sent to the CQ was uploaded after l-g-t-m from nasko@chromium.org
Link to the patchset: https://codereview.chromium.org/1006003005/#ps20001
(title: "adding comment")

[commit-bot: I haz the power, 2015-03-17 23:51:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1006003005/20001

[commit-bot: I haz the power, 2015-03-18 00:14:09]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-03-18 00:14:43]

Patchset 2 (id:??) landed as
https://crrev.com/f032c0d065a5387a2e490e45bbec046e5a1bda61
Cr-Commit-Position: refs/heads/master@{#321024}