sRGB support in Ganesh. Several pieces:

include/gpu/GrColor.h

Index: include/gpu/GrColor.h
diff --git a/include/gpu/GrColor.h b/include/gpu/GrColor.h
index 6b83237626ae590746757ac28ce22b9a5c22a3f8..2a7a567a8820a2d4453eef692a5f5d2c6f0bf1ff 100644
--- a/include/gpu/GrColor.h
+++ b/include/gpu/GrColor.h
@@ -218,6 +218,7 @@ static inline uint32_t GrPixelConfigComponentMask(GrPixelConfig config) {
         kRGBA_GrColorComponentFlags,    // kRGBA_8888_GrPixelConfig
         kRGBA_GrColorComponentFlags,    // kBGRA_8888_GrPixelConfig
         kRGBA_GrColorComponentFlags,    // kSRGBA_8888_GrPixelConfig
+        kRGBA_GrColorComponentFlags,    // kSBGRA_8888_GrPixelConfig
         kRGB_GrColorComponentFlags,     // kETC1_GrPixelConfig
         kA_GrColorComponentFlag,        // kLATC_GrPixelConfig
         kA_GrColorComponentFlag,        // kR11_EAC_GrPixelConfig
@@ -236,13 +237,14 @@ static inline uint32_t GrPixelConfigComponentMask(GrPixelConfig config) {
     GR_STATIC_ASSERT(5  == kRGBA_8888_GrPixelConfig);
     GR_STATIC_ASSERT(6  == kBGRA_8888_GrPixelConfig);
     GR_STATIC_ASSERT(7  == kSRGBA_8888_GrPixelConfig);
-    GR_STATIC_ASSERT(8  == kETC1_GrPixelConfig);
-    GR_STATIC_ASSERT(9  == kLATC_GrPixelConfig);
-    GR_STATIC_ASSERT(10  == kR11_EAC_GrPixelConfig);
-    GR_STATIC_ASSERT(11 == kASTC_12x12_GrPixelConfig);
-    GR_STATIC_ASSERT(12 == kRGBA_float_GrPixelConfig);
-    GR_STATIC_ASSERT(13 == kAlpha_half_GrPixelConfig);
-    GR_STATIC_ASSERT(14 == kRGBA_half_GrPixelConfig);
+    GR_STATIC_ASSERT(8  == kSBGRA_8888_GrPixelConfig);
+    GR_STATIC_ASSERT(9  == kETC1_GrPixelConfig);
+    GR_STATIC_ASSERT(10  == kLATC_GrPixelConfig);
+    GR_STATIC_ASSERT(11  == kR11_EAC_GrPixelConfig);
+    GR_STATIC_ASSERT(12 == kASTC_12x12_GrPixelConfig);
+    GR_STATIC_ASSERT(13 == kRGBA_float_GrPixelConfig);
+    GR_STATIC_ASSERT(14 == kAlpha_half_GrPixelConfig);
+    GR_STATIC_ASSERT(15 == kRGBA_half_GrPixelConfig);
     GR_STATIC_ASSERT(SK_ARRAY_COUNT(kFlags) == kGrPixelConfigCnt);
 }