Adds a field trial flag to control whether to use an alternate Instant search base page URL for pre…

Adds a field trial flag to control whether to use an alternate Instant search base page URL for prefetching search results.

BUG=382694
TEST=Run chrome with the following field trial flag and observe the Instant search base page url.
     --force-fieldtrials="EmbeddedSearch/Group1 use_alternate_instant_url:1 /"

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=278824

[kmadhusu, 2014-06-20 03:23:33]

Please review.

Thanks.

[samarth, 2014-06-20 04:43:23]

lgtm

https://codereview.chromium.org/330653004/diff/1/chrome/browser/search/search.cc
File chrome/browser/search/search.cc (right):

https://codereview.chromium.org/330653004/diff/1/chrome/browser/search/search...
chrome/browser/search/search.cc:852: bool ShouldUseAltInstantURL() {
Put this in an anonymous namespace?

[kmadhusu, 2014-06-20 16:01:53]

Thanks.

https://codereview.chromium.org/330653004/diff/1/chrome/browser/search/search.cc
File chrome/browser/search/search.cc (right):

https://codereview.chromium.org/330653004/diff/1/chrome/browser/search/search...
chrome/browser/search/search.cc:852: bool ShouldUseAltInstantURL() {
On 2014/06/20 04:43:23, samarth wrote:
> Put this in an anonymous namespace?

If I put this in anonymous namespace, I will not be able to test this function
separately.

[kmadhusu, 2014-06-20 16:12:57]

The CQ bit was checked by kmadhusu@chromium.org

[commit-bot: I haz the power, 2014-06-20 16:15:54]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/kmadhusu@chromium.org/330653004/20001

[commit-bot: I haz the power, 2014-06-20 20:22:48]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_dbg_triggered_tests on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_dbg_triggered...)

[commit-bot: I haz the power, 2014-06-20 21:21:39]

Change committed as 278824