[Impeller] move Aiks path unittests to DL (flutter#53799)

Move more impeller tests to display list format. This allows our integration tests to also test the display list -> aiks interop and be future compatible with the new canvas backend that removes AIKS.

Part of flutter/flutter#142054

ci/licenses_golden/excluded_files

@@ -127,7 +127,6 @@
 ../../../flutter/impeller/aiks/aiks_blend_unittests.cc
 ../../../flutter/impeller/aiks/aiks_blur_unittests.cc
 ../../../flutter/impeller/aiks/aiks_gradient_unittests.cc
-../../../flutter/impeller/aiks/aiks_path_unittests.cc
 ../../../flutter/impeller/aiks/aiks_unittests.cc
 ../../../flutter/impeller/aiks/aiks_unittests.h
 ../../../flutter/impeller/aiks/canvas_unittests.cc

display_list/dl_color.h

@@ -14,6 +14,15 @@ struct DlColor {
   constexpr DlColor() : argb_(0xFF000000) {}
   constexpr explicit DlColor(uint32_t argb) : argb_(argb) {}
 
+  /// @brief Construct a 32 bit color from a floating point A, R, G, and B color
+  /// channel.
+  constexpr explicit DlColor(SkScalar a, SkScalar r, SkScalar g, SkScalar b)
+      : argb_(static_cast<uint8_t>(std::round(a * 255)) << 24 |  //
+              static_cast<uint8_t>(std::round(r * 255)) << 16 |  //
+              static_cast<uint8_t>(std::round(g * 255)) << 8 |   //
+              static_cast<uint8_t>(std::round(b * 255)) << 0     //
+        ) {}
+
   static constexpr uint8_t toAlpha(SkScalar opacity) { return toC(opacity); }
   static constexpr SkScalar toOpacity(uint8_t alpha) { return toF(alpha); }
 

impeller/aiks/BUILD.gn

@@ -78,7 +78,6 @@ template("aiks_unittests_component") {
     "aiks_blend_unittests.cc",
     "aiks_blur_unittests.cc",
     "aiks_gradient_unittests.cc",
-    "aiks_path_unittests.cc",
     "aiks_unittests.cc",
     "aiks_unittests.h",
   ]