Rename ColorSpaceUtilities namepsace to color_space_utilities

https://google.github.io/styleguide/cppguide.html#Namespace_Names
> Namespace names are all lower-case.

This CL has no behavior changes.

Bug: 889726
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I361dbb5b1bf477623a772f1b0e6d074283bf6c5d
Reviewed-on: https://chromium-review.googlesource.com/c/1258642Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Hwanseung Lee <hs1217.lee@samsung.com>
Cr-Commit-Position: refs/heads/master@{#596126}

third_party/blink/renderer/core/css/media_values.cc

@@ -172,7 +172,7 @@ DisplayShape MediaValues::CalculateDisplayShape(LocalFrame* frame) {
 ColorSpaceGamut MediaValues::CalculateColorGamut(LocalFrame* frame) {
   DCHECK(frame);
   DCHECK(frame->GetPage());
-  return ColorSpaceUtilities::GetColorSpaceGamut(
+  return color_space_utilities::GetColorSpaceGamut(
       frame->GetPage()->GetChromeClient().GetScreenInfo());
 }
 

third_party/blink/renderer/platform/graphics/bitmap_image_metrics.cc

@@ -78,8 +78,8 @@ void BitmapImageMetrics::CountImageGammaAndGamut(
   DEFINE_THREAD_SAFE_STATIC_LOCAL(
       EnumerationHistogram, gamut_named_histogram,
       ("Blink.ColorGamut.Source", static_cast<int>(ColorSpaceGamut::kEnd)));
-  gamut_named_histogram.Count(
-      static_cast<int>(ColorSpaceUtilities::GetColorSpaceGamut(color_profile)));
+  gamut_named_histogram.Count(static_cast<int>(
+      color_space_utilities::GetColorSpaceGamut(color_profile)));
 }
 
 void BitmapImageMetrics::CountJpegArea(const IntSize& size) {

third_party/blink/renderer/platform/graphics/color_space_gamut.cc

@@ -9,7 +9,7 @@
 
 namespace blink {
 
-namespace ColorSpaceUtilities {
+namespace color_space_utilities {
 
 ColorSpaceGamut GetColorSpaceGamut(const WebScreenInfo& screen_info) {
   const gfx::ColorSpace& color_space = screen_info.color_space;
@@ -19,7 +19,7 @@ ColorSpaceGamut GetColorSpaceGamut(const WebScreenInfo& screen_info) {
   // wide gamut for HDR profiles).
   skcms_ICCProfile color_profile;
   color_space.GetRasterColorSpace().ToSkColorSpace()->toProfile(&color_profile);
-  return ColorSpaceUtilities::GetColorSpaceGamut(&color_profile);
+  return color_space_utilities::GetColorSpaceGamut(&color_profile);
 }
 
 ColorSpaceGamut GetColorSpaceGamut(const skcms_ICCProfile* color_profile) {
@@ -62,6 +62,6 @@ ColorSpaceGamut GetColorSpaceGamut(const skcms_ICCProfile* color_profile) {
   return ColorSpaceGamut::kUltraWide;
 }
 
-}  // namespace ColorSpaceUtilities
+}  // namespace color_space_utilities
 
 }  // namespace blink

third_party/blink/renderer/platform/graphics/color_space_gamut.h

@@ -29,12 +29,12 @@ enum class ColorSpaceGamut {
   kEnd
 };
 
-namespace ColorSpaceUtilities {
+namespace color_space_utilities {
 
 PLATFORM_EXPORT ColorSpaceGamut GetColorSpaceGamut(const WebScreenInfo&);
 ColorSpaceGamut GetColorSpaceGamut(const skcms_ICCProfile*);
 
-}  // namespace ColorSpaceUtilities
+}  // namespace color_space_utilities
 
 }  // namespace blink
 

third_party/blink/tools/audit_non_blink_usage.py

@@ -290,6 +290,12 @@ _CONFIG = [
             'detail::.+',
         ],
     },
+    {
+        'paths': ['third_party/blink/renderer/core/css/media_values.cc'],
+        'allowed': [
+            'color_space_utilities::GetColorSpaceGamut',
+        ],
+    },
     {
         'paths': ['third_party/blink/renderer/core/fetch/data_consumer_handle_test_util.cc'],
         'allowed': [