android: Blacklist failed driver for async readback

As of Android 4.4.2, driver for Qualcomm is still inconsistent wrt async
readback.  Expand blacklist.

BUG=278606

Review URL: https://codereview.chromium.org/173893007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252508 0039d316-1c4b-4281-b951-d872f2087c98
Fix CopyTextureCHROMIUM for external textures without GLImage

r247334 introduced a behavioral change there as I didn't expect
GL_TEXTURE_EXTERNAL_OES to be used outside of Android.

This reverts the behavior for uses cases other than Android video
to what it was before. (Note that on Android there *is* a GLImage
attached.)

BUG=340104

Review URL: https://codereview.chromium.org/174163005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252509 0039d316-1c4b-4281-b951-d872f2087c98
Fix PluginSpecialCases when WIDEVINE_CDM_IS_COMPONENT.

One of the plugins is not automatically registered when that is defined.
This CL manually registers the plugin when necessary.

BUG=345344
TBR=jochen@chromium.org

Review URL: https://codereview.chromium.org/174553003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252510 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252509
SVN changes up to revision 252510