DevTools: [SSP] show source location for the newly inserted style rules.

DevTools: [SSP] show source location for the newly inserted style rules.

To achieve the specified goal, the patch does the following:
- StylePropertiesSection.styleRule no longer has sourceURL as it could
be always fetched from styleRule.rule
- StylePropertiesSection._createRuleOrigin is receiving CSSRule and
ruleLocation as arguments
- BlankStylePropertiesSection is taught to infer the actual rule
location of the rule that will be inserted

Layout Test change: the CSSOM rule now don't show source location (used to be "located" on first line)

R=pfeldman, vsevik, apavlov

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=180348

[lushnikov, 2014-08-14 19:59:05]

ptal

[apavlov, 2014-08-15 08:29:38]

lgtm with a comment

https://codereview.chromium.org/474433004/diff/20001/Source/devtools/front_en...
File Source/devtools/front_end/elements/StylesSidebarPane.js (right):

https://codereview.chromium.org/474433004/diff/20001/Source/devtools/front_en...
Source/devtools/front_end/elements/StylesSidebarPane.js:1936: var editRange =
new WebInspector.TextRange(0, 0, lines.length - 1, lines[lines.length -
1].length);
lines.peekLast().length

[lushnikov, 2014-08-15 08:40:42]

The CQ bit was checked by lushnikov@chromium.org

[commit-bot: I haz the power, 2014-08-15 08:41:38]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/lushnikov@chromium.org/474433004/20001

[lushnikov, 2014-08-15 08:47:23]

The CQ bit was unchecked by lushnikov@chromium.org

[apavlov, 2014-08-15 09:40:25]

lgtm

[lushnikov, 2014-08-15 09:40:34]

The CQ bit was checked by lushnikov@chromium.org

[commit-bot: I haz the power, 2014-08-15 09:41:47]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/lushnikov@chromium.org/474433004/30003

[commit-bot: I haz the power, 2014-08-15 10:40:31]

Committed patchset #3 (30003) as 180348