Rename InterpolationSpaceUtilities namepsace to interpolation_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
Change-Id: Ie8abf5434c3501a4b94b99af00cc909a0afac1a2
Reviewed-on: https://chromium-review.googlesource.com/c/1292668Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Zhuoyu Qian <zhuoyu.qian@samsung.com>
Cr-Commit-Position: refs/heads/master@{#601495}

third_party/blink/renderer/platform/graphics/filters/filter_effect.cc

@@ -104,7 +104,7 @@ void FilterEffect::DisposeImageFiltersRecursive() {
 Color FilterEffect::AdaptColorToOperatingInterpolationSpace(
     const Color& device_color) {
   // |deviceColor| is assumed to be DeviceRGB.
-  return InterpolationSpaceUtilities::ConvertColor(
+  return interpolation_space_utilities::ConvertColor(
       device_color, OperatingInterpolationSpace());
 }
 

third_party/blink/renderer/platform/graphics/filters/paint_filter_builder.cc

@@ -102,7 +102,7 @@ sk_sp<PaintFilter> TransformInterpolationSpace(
     InterpolationSpace src_interpolation_space,
     InterpolationSpace dst_interpolation_space) {
   sk_sp<SkColorFilter> color_filter =
-      InterpolationSpaceUtilities::CreateInterpolationSpaceFilter(
+      interpolation_space_utilities::CreateInterpolationSpaceFilter(
           src_interpolation_space, dst_interpolation_space);
   if (!color_filter)
     return input;

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

@@ -1390,10 +1390,10 @@ sk_sp<SkColorFilter> GraphicsContext::WebCoreColorFilterToSkiaColorFilter(
     case kColorFilterLuminanceToAlpha:
       return SkLumaColorFilter::Make();
     case kColorFilterLinearRGBToSRGB:
-      return InterpolationSpaceUtilities::CreateInterpolationSpaceFilter(
+      return interpolation_space_utilities::CreateInterpolationSpaceFilter(
           kInterpolationSpaceLinear, kInterpolationSpaceSRGB);
     case kColorFilterSRGBToLinearRGB:
-      return InterpolationSpaceUtilities::CreateInterpolationSpaceFilter(
+      return interpolation_space_utilities::CreateInterpolationSpaceFilter(
           kInterpolationSpaceSRGB, kInterpolationSpaceLinear);
     case kColorFilterNone:
       break;

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

@@ -36,7 +36,7 @@
 
 namespace blink {
 
-namespace InterpolationSpaceUtilities {
+namespace interpolation_space_utilities {
 
 namespace {
 
@@ -76,6 +76,6 @@ sk_sp<SkColorFilter> CreateInterpolationSpaceFilter(
   return GetConversionFilter(dst_interpolation_space, src_interpolation_space);
 }
 
-}  // namespace InterpolationSpaceUtilities
+}  // namespace interpolation_space_utilities
 
 }  // namespace blink

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

@@ -42,7 +42,7 @@ enum InterpolationSpace {
   kInterpolationSpaceLinear
 };
 
-namespace InterpolationSpaceUtilities {
+namespace interpolation_space_utilities {
 
 // Convert a Color assumed to be in the |src_interpolation_space| into the
 // |dst_interpolation_space|.
@@ -57,7 +57,7 @@ sk_sp<SkColorFilter> CreateInterpolationSpaceFilter(
     InterpolationSpace src_interpolation_space,
     InterpolationSpace dst_interpolation_space);
 
-}  // namespace InterpolationSpaceUtilities
+}  // namespace interpolation_space_utilities
 
 }  // namespace blink