DO NOT MERGE Inspect SkShader to determine hw shader.

cherry-pick of Iaa7189178bda1c55f96da044d2a9fa602ba36034

Instead of duplicating internal info about SkShader, inspect the
SkShader installed on the SkPaint.

core/java/android/view/GLES20Canvas.java:
Remove setupModifiers, nResetModifiers, and nSetupShader.

core/jni/android/graphics/Shader.cpp:
Remove calls to create/destroy the (previously) attached SkiaShader.

core/jni/android_view_GLES20Canvas.cpp:
Remove native code for setupShader and resetModifiers.

graphics/java/android/graphics/BitmapShader.java:
graphics/java/android/graphics/ComposeShader.java:
graphics/java/android/graphics/LinearGradient.java:
graphics/java/android/graphics/RadialGradient.java:
graphics/java/android/graphics/Shader.java:
graphics/java/android/graphics/SweepGradient.java:
Remove code keeping track of native SkiaShader.

libs/hwui/Caches.h:
Include Extensions.h.

libs/hwui/DeferredDisplayList.cpp:
Compare shaders on the paint, instead of on DrawModifiers.

libs/hwui/DisplayList.cpp:
libs/hwui/DisplayList.h:
Remove vector of SkiaShaders.

libs/hwui/DisplayListOp.h:
Access the SkShader on mPaint.
Remove SetupShaderOp and ResetShaderOp.

libs/hwui/DisplayListRenderer.cpp:
libs/hwui/DisplayListRenderer.h:
Remove resetShader, setupShader, refShader, and mShaderMap.

libs/hwui/FontRenderer.cpp:
Pass SkShader to setupDrawShader and setupDrawShaderUniforms.

libs/hwui/OpenGLRenderer.cpp:
libs/hwui/OpenGLRenderer.h:
Add LayerShader, a class inheriting from SkShader, to mimic the
behavior of SkiaLayerShader. Unlike SkiaLayerShader, it can be set on
the SkPaint so it can be inspected later.
Set a LayerShader instead of a SkiaLayerShader.
setupDrawShader and setupDrawShaderUniforms now inspect an SkShader
passed in.
Inspect SkShader instead of mDrawModifiers.mShader.
Remove resetShader and setupShader.
setupDrawColorUniforms now takes a boolean indicating whether there is
a shader.
Add an inline function for accessing the SkShader on an SkPaint.
In setupDrawBlending(Layer*, bool), do not check the shader (which will
never be set), but do check whether the color filter may change the
alpha (newly fixed behavior).
In setupDrawBlending(SkPaint, ...), check the SkShader and whether the
color filter affects alpha (the latter is new behavior).

libs/hwui/Renderer.h:
Remove pure virtual functions setupShader and resetShader.

libs/hwui/ResourceCache.cpp:
libs/hwui/ResourceCache.h:
Remove functions for refing/unrefing shaders.

libs/hwui/SkiaShader.cpp:
libs/hwui/SkiaShader.h:
Much of this code was redundant and has been removed.
Convert structs into class with nothing but static functions for
calling describe/setupProgram.

libs/hwui/TextureCache.cpp:
libs/hwui/TextureCache.h:
Use the SkPixelRef as the key to the bitmap Lru cache, since shader
inspection will provide a different SkBitmap pointer (though it will
hold the correct SkPixelRef with the correct generation ID).

tests/CanvasCompare/src/com/android/test/hwuicompare/DisplayModifier.java:
tests/CanvasCompare/src/com/android/test/hwuicompare/ResourceModifiers.java:
Update manual test to have more shaders: radial, sweep, compose,
invalid compose.

BUG:10650594
Change-Id: I2e7182b3fc28268e7ca82fac6780540b6b45365c
28 files changed