respect srgb gamma when building mips

src/core/SkBitmapProcShader.cpp

Index: src/core/SkBitmapProcShader.cpp
diff --git a/src/core/SkBitmapProcShader.cpp b/src/core/SkBitmapProcShader.cpp
index a372b5199041d9c608d608ecac302ae8f24aced6..50d3898a3ca957b70c9abdb2b0fe404a6ae9640f 100644
--- a/src/core/SkBitmapProcShader.cpp
+++ b/src/core/SkBitmapProcShader.cpp
@@ -226,10 +226,11 @@ SkShader::Context* SkBitmapProcShader::MakeContext(const SkShader& shader,
 
     // Decide if we can/want to use the new linear pipeline
     bool useLinearPipeline = choose_linear_pipeline(rec, provider.info());
+    SkMipMap::SrcGammaMode mode = SkMipMap::DeduceMode(rec);
 
     if (useLinearPipeline) {
         void* infoStorage = (char*)storage + sizeof(LinearPipelineContext);
-        SkBitmapProcInfo* info = new (infoStorage) SkBitmapProcInfo(provider, tmx, tmy);
+        SkBitmapProcInfo* info = new (infoStorage) SkBitmapProcInfo(provider, tmx, tmy, mode);
         if (!info->init(totalInverse, *rec.fPaint)) {
             info->~SkBitmapProcInfo();
             return nullptr;
@@ -238,7 +239,7 @@ SkShader::Context* SkBitmapProcShader::MakeContext(const SkShader& shader,
         return new (storage) LinearPipelineContext(shader, rec, info);
     } else {
         void* stateStorage = (char*)storage + sizeof(BitmapProcShaderContext);
-        SkBitmapProcState* state = new (stateStorage) SkBitmapProcState(provider, tmx, tmy);
+        SkBitmapProcState* state = new (stateStorage) SkBitmapProcState(provider, tmx, tmy, mode);
         if (!state->setup(totalInverse, *rec.fPaint)) {
             state->~SkBitmapProcState();
             return nullptr;