Make TextFields reroute mouse wheel messages

The text-fields were not rerouting mouse-wheel messages, causing the window under the mouse not to scroll when a text-field (such as the find-box) was focused.

BUG=9647
TEST=Navigate to a page long enough to have vertical scroll-bars (ex: http://slashdot.org). CTRL-F to open the find in page box. While the mouse is over the page (but the find in bar text-field has focus) use the mouse scroll-wheel). The page should scroll.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=13794

[amit, 2009-04-15 17:50:57]

lgtm.

Given the frequency of regressions in this area, it would be nice to have a test
for this.

[jcampan, 2009-04-15 19:32:41]

> Given the frequency of regressions in this area, it would be nice to
>have a test for this.
I was afraid you would say that :-)
I created a unit-test. The test is not perfect as it does not cover the browser
omnibox or the render view window but it should catch any regressions at the
view level.

[amit, 2009-04-15 20:52:23]

nice, lgtm.

http://codereview.chromium.org/73087/diff/1002/1004
File chrome/views/view_unittest.cc (right):

http://codereview.chromium.org/73087/diff/1002/1004#newcode789
Line 789: window2->Show();
Does showing automatically activate this window? This window needs to active
(i.e. receiving user input) in order to test the intended redirection. Or more
accurately, we need to make sure that window1 is not active :)