Optimizing some icon generation code in bubble

> Generating only one bitmap when creating appIcon
> Extracting the scale during icon generation for main icon
  instead of running icon normalizer again
> Avoiding unnecessary color extraction on main icon

Bug: 238937089
Test: Verified on device
Change-Id: Ia01801f15e5982593852f05c2512d0f1f737f5f7
3 files changed