Add PPB_Fullscreen_Dev;0.5. Keep 0.4 for backwards compatiblity and point it

to PPB_FlashFullscreen. The new implementation is based on
http://codereview.chromium.org/7714017/ with some bug fixes.
Update header comments.

Main API differences between the old and the new implementation:
- transition from fullscreen is now asynchronous and ends at DidChangeView
just like transition to fullscreen; graphics devices cannot be bound during
the transition.
- when switching to/from fullscreen 3D resources no longer need to be
re-created.
- transitions to fullscreen are only possible when processing user user gestures.
- transition to fullscreen results in 2 DidChangeViews, one for moving the
plugin to the middle of the window and one for stretching the window and
placing the plugin in the middle of the screen.
- the size of the plugin is not changed when going to/from fullscreen.

Testing:
- Mapped ppapi_tests:test_fullscreen to ppapi_tests:test_flash_fullscreen.
- Updated test_fullscreen to work with the new implementation. To be testable
automatically this needs enhancements to the testing infrastructure
for generating user gestures. For now marked the test as DISABLED.
- Disabled NaCl's ppapi_ppb_fullscreen_browser_test for the same reasons
as above.
- To re-enable both tests, we will first need to add user gesture capabilites
to PPB_Testing.
- Build 0.4 ppapi_test:test_fullscreen and ran this out of process and in
process with the newly build revision of chrome to verify backwards
compatability.
- In a separate CL, will update NaCl's ppapi_ppb_fullscreen_browser_test to work
with the new implementation, for now only manually.

BUG=41780
TEST=see above
Review URL: http://codereview.chromium.org/7826017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@102888 0039d316-1c4b-4281-b951-d872f2087c98

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