Accounting for image scaling when calculating color extraction

> Also caching display size instead of making RPC in every frame

Bug: 194232172
Fix: 195435616
Test: Manual
Change-Id: I1b71a2316e7b8b7fde6190abd75be89330e2d051
(cherry picked from commit 00471fb4c9ef39c0be47a7dc8642d0c9afc9f859)
1 file changed