Dest color space no longer impacts mipmaps or texture sampling

PS5: Removes SkDestinationSurfaceColorMode, tracking of mipmap
mode on GrTexture, sRGB decode state per-texture. Because we
were often choosing sRGB configs for RGB color types, legacy
rendering would then be incorrect (too dark). So...

PS7: Stops ever using sRGB pixel configs when translating
image info or color type. Also removes a bunch of GrCaps bits
and a GrContextOption that are no longer relevant.

PS9: Adjusts surface creation unit test expectations, and
changes the raster rules accordingly.

At this point, sRGB configs are (obviously) going to be broken.

Locally, I ran 8888, gl, and the gbr- versions of both. Across
all GMs x configs, there are 13 diffs. 12 are GMs that create
surfaces with a color-space attached (and thus, the offscreen
is no longer getting sRGB pixel config). The only remainder
constructs an SkPictureImageGenerator, (with an attached color
space) and renders it to the gbr-gl canvas, which triggers a
a tagged surface inside the generator.

Bug: skia:
Change-Id: Ie5edfa157dd799f3121e8173fc4f97f6c8ed6789
Reviewed-on: https://skia-review.googlesource.com/131282
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/text/GrAtlasManager.cpp b/src/gpu/text/GrAtlasManager.cpp
index e9737cc..f75224d 100644
--- a/src/gpu/text/GrAtlasManager.cpp
+++ b/src/gpu/text/GrAtlasManager.cpp
@@ -71,14 +71,14 @@
 GrAtlasManager::~GrAtlasManager() {
 }
 
-static GrPixelConfig mask_format_to_pixel_config(GrMaskFormat format, const GrCaps& caps) {
+static GrPixelConfig mask_format_to_pixel_config(GrMaskFormat format) {
     switch (format) {
         case kA8_GrMaskFormat:
             return kAlpha_8_GrPixelConfig;
         case kA565_GrMaskFormat:
             return kRGB_565_GrPixelConfig;
         case kARGB_GrMaskFormat:
-            return caps.srgbSupport() ? kSRGBA_8888_GrPixelConfig : kRGBA_8888_GrPixelConfig;
+            return kRGBA_8888_GrPixelConfig;
         default:
             SkDEBUGFAIL("unsupported GrMaskFormat");
             return kAlpha_8_GrPixelConfig;
@@ -208,7 +208,7 @@
 bool GrAtlasManager::initAtlas(GrMaskFormat format) {
     int index = MaskFormatToAtlasIndex(format);
     if (!fAtlases[index]) {
-        GrPixelConfig config = mask_format_to_pixel_config(format, *fCaps);
+        GrPixelConfig config = mask_format_to_pixel_config(format);
         int width = fAtlasConfigs[index].fWidth;
         int height = fAtlasConfigs[index].fHeight;
         int numPlotsX = fAtlasConfigs[index].numPlotsX();