Use unique URLs rather than qualifiers to uniquify RenderProcesses.

Use unique URLs rather than qualifiers to uniquify RenderProcesses.

This is so code in the browser has something tangible to call ConnectToApplication() on. When a RenderProcessHost creates a new renderer, it creates a URL of the style exe:chrome_renderer#, where # is the RenderProcess ID. It stores this string on the RenderProcessHost's SupportsUserData. Call content/browser/mojo/mojo_shell_client_host.h's GetMojoApplicationInstanceURL() with a particular RPH to get the URL to connect to it.

R=jam@chromium.org
http://crbug.com/558009

Committed: https://crrev.com/2c951446b15306358aa7167a956b005e6edec973
Cr-Commit-Position: refs/heads/master@{#360604}

[jam, 2015-11-19 15:20:32]

lgtm

[Ben Goodger (Google), 2015-11-19 15:29:43]

The CQ bit was checked by ben@chromium.org

[Ben Goodger (Google), 2015-11-19 15:29:43]

The patchset sent to the CQ was uploaded after l-g-t-m from jam@chromium.org
Link to the patchset: https://codereview.chromium.org/1455323002/#ps40001
(title: ".")

[commit-bot: I haz the power, 2015-11-19 15:29:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1455323002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1455323002/40001

[commit-bot: I haz the power, 2015-11-19 16:43:56]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-11-19 16:44:42]

Patchset 3 (id:??) landed as
https://crrev.com/2c951446b15306358aa7167a956b005e6edec973
Cr-Commit-Position: refs/heads/master@{#360604}