skia: Perform -O3 optimization
skia: Perform -O3 optimization

Change-Id: I0818b1d11089f3102b55d4770a6e93e666a2fb36

VRToxin-AOSP/android_external_skia,VRToxin-AOSP/android_external_skia,VRToxin-AOSP/android_external_skia,VRToxin-AOSP/android_external_skia,VRToxin-AOSP/android_external_skia,VRToxin-AOSP/android_external_skia,VRToxin-AOSP/android_external_skia,VRToxin-AOSP/android_external_skia,VRToxin-AOSP/android_external_skia