Remove BitmapPlatformDeviceData, and merge its functionality into the appropriate BitmapPlatformDevice. It was a little twisty maze of #ifdefs, ostensibly created to allow successful assignment and copy construction of the device. However, I could not find any such use, and the BitmapPlatformDevices are all marked DISALLOW_COPY_AND_ASSIGN!

Instead, we use a subclass of SkPixelRef to handle ownership of the platform-specific bitmaps. This allows correct Skia semantics: the SkBitmap used for device drawing can safely outlive the device, since it is refcounted. Such a subclass already existed for Windows; this simply implements it for Cairo as well, and uses it in all cases.

TBR=brettw

Review URL: https://codereview.chromium.org/95773002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238213 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238213
Give names to a couple base::AutoLocks missing them.

BUG=

Review URL: https://codereview.chromium.org/99493002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238214 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238214