respect srgb gamma when building mips

src/core/SkBitmapProcState.cpp

Index: src/core/SkBitmapProcState.cpp
diff --git a/src/core/SkBitmapProcState.cpp b/src/core/SkBitmapProcState.cpp
index 33dd8f5194e938891ef32731ec5901f4073e4521..9512fc4cde77c0a496837c9033572286ab7d63ca 100644
--- a/src/core/SkBitmapProcState.cpp
+++ b/src/core/SkBitmapProcState.cpp
@@ -37,18 +37,22 @@ extern void Clamp_S32_opaque_D32_nofilter_DX_shaderproc(const void*, int, int, u
 #include "SkBitmapProcState_procs.h"
 
 SkBitmapProcInfo::SkBitmapProcInfo(const SkBitmapProvider& provider,
-                                   SkShader::TileMode tmx, SkShader::TileMode tmy)
+                                   SkShader::TileMode tmx, SkShader::TileMode tmy,
+                                   SkMipMap::SrcGammaMode mode)
     : fProvider(provider)
     , fTileModeX(tmx)
     , fTileModeY(tmy)
+    , fSrcGammaMode(mode)
     , fBMState(nullptr)
 {}
 
 SkBitmapProcInfo::SkBitmapProcInfo(const SkBitmap& bm,
-                                   SkShader::TileMode tmx, SkShader::TileMode tmy)
+                                   SkShader::TileMode tmx, SkShader::TileMode tmy,
+                                   SkMipMap::SrcGammaMode mode)
     : fProvider(SkBitmapProvider(bm))
     , fTileModeX(tmx)
     , fTileModeY(tmy)
+    , fSrcGammaMode(mode)
     , fBMState(nullptr)
 {}
 
@@ -129,7 +133,7 @@ bool SkBitmapProcInfo::init(const SkMatrix& inv, const SkPaint& paint) {
         allow_ignore_fractional_translate = false;
     }
 
-    SkDefaultBitmapController controller;
+    SkDefaultBitmapController controller(fSrcGammaMode);
     fBMState = controller.requestBitmap(fProvider, inv, paint.getFilterQuality(),
                                         fBMStateStorage.get(), fBMStateStorage.size());
     // Note : we allow the controller to return an empty (zero-dimension) result. Should we?