Merge 22799 - Set up a interposing library for Carbon calls made by plugins....

Merge 22799 - Set up a interposing library for Carbon calls made by plugins.

This gives us a library that's inserted into plugin process via DYLD_INSERT_LIBRARIES to intercept Carbon calls, and moves the window/process activation handling into that library (based on Carbon window activation/deactivation calls, rather than polling the front window). Over time we'll interpose more, but this gives us the foundation.

This fixes both the "window loses focus when loading a page with plugins" and "can't click on YouTube controls" bugs.

BUG=18203, 18553
TEST=Clicking on Flash plugins should work much more reliably, opening a page with a plugin shouldn't cause the window to lose focus.

Review URL: http://codereview.chromium.org/164100

TBR=stuartmorgan@google.com

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=22936