Simple shell that loads a dll and calls an entrypoint function passing in a handle to a pipe created by the shell app.

To achieve this I had to make mojo_system a <(component) so sample_app.dll could link against it. Trung, Darin tells me you had a different idea about how to achieve this. Consider this CL a starting point for the discussion :-)

R=darin@chromium.org
BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=227604

Review URL: https://codereview.chromium.org/25895002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227983 0039d316-1c4b-4281-b951-d872f2087c98
Check RenderViewHost pointer, it may be deleted before PrintingMessageFilter.
PrintingMessageFilter is ref counted class, so if we post message, it may hold PrintingMessageFilter instance longer then RenderViewHost is alive.

BUG=298431

Review URL: https://codereview.chromium.org/26320009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227984 0039d316-1c4b-4281-b951-d872f2087c98
Remove NOTIFICATION_WEB_CONTENTS_VISIBILITY_CHANGED from web contents modal dialogs.

BUG=170921
TEST=everything still works

Review URL: https://codereview.chromium.org/26554002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227985 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227985
Move MinimalShell to ui/shell.

Move the MinimalShell class from content to a new "shell"
library so it can be shared by app_shell. Also move
aura::test::TestActivationClient to
aura::client::DefaultActivationClient.

BUG=305404

Review URL: https://codereview.chromium.org/26699003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227986 0039d316-1c4b-4281-b951-d872f2087c98
Remove the no longer needed + button field trial.

Metrics showed that the plus button was not getting enough use to justify
it's space in the already constrained UI.

BUG=305010

Review URL: https://codereview.chromium.org/26861002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227987 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227987