Rename lots of things from 'sRGB' to 'GammaCorrect', where appropriate

Trying to be much more explicit about where we really mean sRGB as a format,
and where we mean gamma-correct, as in: "not legacy behavior". Most of the
changes to rendering behavior are dependent on the latter, so let's be precise.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1884873006

Review URL: https://codereview.chromium.org/1884873006
diff --git a/src/views/SkWindow.cpp b/src/views/SkWindow.cpp
index bcc7b02..244bc49 100644
--- a/src/views/SkWindow.cpp
+++ b/src/views/SkWindow.cpp
@@ -74,8 +74,8 @@
     // Set the global flag that enables or disables "legacy" mode, depending on our format.
     // With sRGB 32-bit or linear FP 16, we turn on gamma-correct handling of inputs:
     SkSurfaceProps props = this->getSurfaceProps();
-    uint32_t flags = (props.flags() & ~SkSurfaceProps::kAllowSRGBInputs_Flag) |
-        (SkColorAndProfileAreGammaCorrect(ct, pt) ? SkSurfaceProps::kAllowSRGBInputs_Flag : 0);
+    uint32_t flags = (props.flags() & ~SkSurfaceProps::kGammaCorrect_Flag) |
+        (SkColorAndProfileAreGammaCorrect(ct, pt) ? SkSurfaceProps::kGammaCorrect_Flag : 0);
     this->setSurfaceProps(SkSurfaceProps(flags, props.pixelGeometry()));
 }