Cache window and icon color of splash screen starting window
The background color of splash screen starting window may depend on the declared window background and the content if icon. That may be expensive operations if the drawables are not using pure color. Because the attributes to compute the colors are simple, it only need a few fields to identify whether the incoming request has been computed. So it is worth to cache them with very small extra memory. The cache of a package will be cleared if the package is removed or replaced. It may save the creation time up to 20ms (depends on the complexity of the drawable). Bug: 190176296 Test: atest StartingSurfaceDrawerTests#testColorCache Test: Cold/warm launch app twice and compare the duration of trace name "makeSplashScreenContentView". The second time should be faster. Re-install the app and launch again, the trace will contain "peekWindowBGColor" that means that cache for the package was cleared. Change-Id: I61158416694a226999843fa8fc6a8b23d6893f02
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