sRGB support in Ganesh. Several pieces:

tests/ReadPixelsTest.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCanvas.h"
 #include "SkColorPriv.h"
 #include "SkMathPriv.h"
@@ skipping 406 matching lines @@
 
                 // if the bitmap has pixels allocated before the readPixels,
                 // note that and fill them with pattern
                 bool startsWithPixels = !bmp.isNull();
                 // Try doing the read directly from a non-renderable texture
                 if (startsWithPixels) {
                     fill_dst_bmp_with_init_data(&bmp);
                     GrPixelConfig dstConfig =
                             SkImageInfo2GrPixelConfig(gReadPixelsConfigs[c].fColorType,
                                                       gReadPixelsConfigs[c].fAlphaType,
-                                                      kLinear_SkColorProfileType);
+                                                      kLinear_SkColorProfileType,
+                                                      *texture->getContext()->caps());
                     uint32_t flags = 0;
                     if (gReadPixelsConfigs[c].fAlphaType == kUnpremul_SkAlphaType) {
                         flags = GrContext::kUnpremul_PixelOpsFlag;
                     }
                     bmp.lockPixels();
                     bool success = texture->readPixels(srcRect.fLeft, srcRect.fTop, bmp.width(),
                                                        bmp.height(), dstConfig, bmp.getPixels(),
                                                        bmp.rowBytes(), flags);
                     bmp.unlockPixels();
                     check_read(reporter, bmp, srcRect.fLeft, srcRect.fTop,
@@ skipping 178 matching lines @@
         SkAutoTUnref<SkData> dataB(draw_into_surface(surfB, tx_subset, quality));
 
         REPORTER_ASSERT(reporter, dataA->equals(dataB));
         if (false) {
             dump_to_file("test_image_A.png", dataA);
             dump_to_file("test_image_B.png", dataB);
         }
     }
 }
 #endif