external/skia Hooks for optimized blitting

Add in hooks to allow for overriding blitting operations with
optimized functions

Change-Id: If38010a69d9fe7cf412d91c277db666f2fd7df34
SkBlitter_RGB16: Add device-specific optimization hooks

Change-Id: I18bf4825669fef6fcc10e5d48271e7ea9abb3ed6
(cherry picked from commit 5d5e3dd98e15a5d25fcddf41f00dc5989942d094)
(cherry picked from commit afbd633b035a8b8f6017f52f6ad398a076aee841)
(cherry picked from commit 814fe785689f0b018283fbc2b02a2d230f0221cb)
NEON optimized blitter S32_Opaque_D32_filter_DX

Re-work for latest code base as the -Os compiler options is added.
Overwrite the optimization level at function level.

Change-Id: I732fea7f02f775a4b06884460dea2887d4108820
SkDraw::drawRect  optimization

New class in SkDeviceLooper.cpp falls in in the critical code path of
SkDraw::drawRect().  This new class SkDeviceLooper does nothing except
for bound checking. It copies the modified rect bounds into new pointer
variables and returns them back "if needed". The additional overhead of
creating an object of SkDeviceLooper class and calling member functions
reduces performance.  This patch creates a pre-check condition and if
it succeeds we know for sure SkDeviceLooper won't change the rect
bounds. Under this condition, we avoid using the SkDeviceLooper class.

Change-Id: I11fa13ace8d50d52069e1780a14874e4c34133f2
external/skia: Update QC hooks

Cleaner way to use weak functions for hooks

Change-Id: Ic9ff68b6f406323d464433fb43aef151c07c45e9