Add IPC messages to send data between inspected page and developer tools.
Add IPC messages to send data between inspected page and developer tools.

Although there is no sematic changes I'd like to commit render_messages_internal.h changes in its own CL since trying to combine this change with other(even unrelated) changes lead to mysterious test failures on linux:
http://build.chromium.org/buildbot/try-server/builders/linux/builds/2878
http://build.chromium.org/buildbot/try-server/builders/linux/builds/2877
http://build.chromium.org/buildbot/try-server/builders/linux/builds/2876


Review URL: http://codereview.chromium.org/21451

git-svn-id: http://src.chromium.org/svn/trunk/src@9943 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 85623d70c2ae11c1bd100490500cf687b96b8ae1
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser