Resolve to temporary texture when doing readpixels
Resolve to temporary texture when doing readpixels

We don't want to resolve to the parent texture, as that can cause an accidental swapbuffers when preserveDrawingBuffer is false. Instead create a temporary texture which will stick around for a while.

BUG=55927
TEST=


Review URL: http://codereview.chromium.org/7553018

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@95332 0039d316-1c4b-4281-b951-d872f2087c98

yitian134/chromium,yitian134/chromium,ropik/chromium,adobe/chromium,yitian134/chromium,ropik/chromium,ropik/chromium,ropik/chromium,yitian134/chromium,gavinp/chromium,gavinp/chromium,adobe/chromium,gavinp/chromium,gavinp/chromium,adobe/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,gavinp/chromium,ropik/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,gavinp/chromium,ropik/chromium,yitian134/chromium,ropik/chromium,yitian134/chromium,ropik/chromium,yitian134/chromium,ropik/chromium,gavinp/chromium,gavinp/chromium,adobe/chromium