Show composition text on IME panel when Pepper plugin is focused (Linux).

BUG=83684
TEST=1. On Linux Chrome, load some PPAPI plugin (e.g., ppapi/example)
2. Focus the plugin element
3. Turn on IME and type some text
4. Verify composition text is drawn on the IME candidate panel.

This is the second step for enabling off-the-spot IME on Pepper on ChromeOS/Linux,
continuing from the first step r87215. This patch includes

[many places]
  Add a boolean flag to indicate inline composition is supported or not.
  (WebKit should also be updated for supporting this kind
   of information for the final complete version of Pepper
   IME API, but not in this patch)
[chrome/browser/renderer_host/render_widget_host_view_gtk.cc]
  Control IME context to show composition text on candidate window.
  (In this patch, only RenderWidgetHostViewGtk, i.e., Linux and ChromeOS
   is considered. On Windows and Mac, the behavior stays unchanged.)
[content/renderer/render_view.cc]
  Turn the flag off when Pepper is focused.

and not yet include

- Enhancement of ChromeOS candidate window to have composition text area.
- Proper placement of the candidate window.

Review URL: http://codereview.chromium.org/7041003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@89451 0039d316-1c4b-4281-b951-d872f2087c98

0 files changed, 0 insertions, 0 deletions