Check in r5063 again, along with fix for tests.

Check in r5063 again, along with fix for tests.

Thank you to Android build, for catching the problem, which would
show up elsewhere. Now we access entry->fStorageSlot before
deleting entry.

(Original message:)
Use the SkBitmapHeap to handle SkBitmaps in SkGPipe cross process.

Required moving the LRU handles from SkBitmapHeapEntry to LookupEntry.

Allows simplification of drawBitmap* calls in SkGPipeCanvas.

Review URL: https://codereview.appspot.com/6453113

git-svn-id: http://skia.googlecode.com/svn/trunk@5081 2bbb7eff-a529-9590-31e7-b0007b416f81