commit ff6ff85a93111903f5bf1b238c0428665f98ae55
author Manish Jethani <m.jethani@eyeo.com> Fri Feb 23 07:24:55 2018
committer Commit Bot <commit-bot@chromium.org> Fri Feb 23 07:24:55 2018
tree 0498b0487265c6403f850e74152c6cfbca98e56d
parent 779a8e035025c76ee76bf11f8dc7aa95ebb56c9a

Add injection key for programmatic CSS injections

This builds on crrev.com/c/877663

For programmatic CSS injections via tabs.insertCSS, we calculate an
"injection key" deterministically based on either the file URL or the
code string. This enables us to later remove the injected CSS by the
same parameters that were used to inject it.

Changes:

 1.  ExtensionMsg_ExecuteCode_Params has a new member called
     injection_key of type base::Optional<std::string>
 2.  ScriptExecutor::ExecuteScript now calculates an injection key for
     CSS injections; this is a combination of the type (file or code),
     the host ID, and the hash digest (base::Hash) of either the file
     URL, if available, or the the code string
 3.  ScriptInjector has a new method called GetInjectionKey;
     UserScriptInjector always returns null, whereas
     ProgrammaticScriptInjector returns the value passed to it via
     ExtensionMsg_ExecuteCode_Params
 4.  ScriptInjection::InjectCss now passes the actual injection key to
     WebDocument::InsertStyleSheet

BUG=608854

Change-Id: I91a3983682cc61d739d3c31a11e8f58dabb8e12c
Reviewed-on: https://chromium-review.googlesource.com/913628
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Manish Jethani <m.jethani@eyeo.com>
Cr-Commit-Position: refs/heads/master@{#538722}