sRGB support in Ganesh. Several pieces:

src/views/SkWindow.cpp

Index: src/views/SkWindow.cpp
diff --git a/src/views/SkWindow.cpp b/src/views/SkWindow.cpp
index 82c1a43c0a5599475a7747ebfe5bce28e54d2296..056b3eab5098ee3c96fd4d5c0337753e3ba37c5b 100644
--- a/src/views/SkWindow.cpp
+++ b/src/views/SkWindow.cpp
@@ -329,9 +329,13 @@ GrRenderTarget* SkWindow::renderTarget(const AttachmentInfo& attachmentInfo,
     // TODO: Query the actual framebuffer for sRGB capable. However, to
     // preserve old (fake-linear) behavior, we don't do this. Instead, rely
     // on the flag (currently driven via 'C' mode in SampleApp).
-    desc.fConfig = (info().profileType() == kSRGB_SkColorProfileType ||
+    //
+    // Also, we may not have real sRGB support (ANGLE, in particular), so check for
+    // that, and fall back to L32:
+    desc.fConfig = grContext->caps()->srgbSupport() &&
+                   (info().profileType() == kSRGB_SkColorProfileType ||
                     info().colorType() == kRGBA_F16_SkColorType)
-        ? kSRGBA_8888_GrPixelConfig // This may not be the right byte-order
+        ? kSkiaGamma8888_GrPixelConfig
         : kSkia8888_GrPixelConfig;
     desc.fOrigin = kBottomLeft_GrSurfaceOrigin;
     desc.fSampleCnt = attachmentInfo.fSampleCount;