[Impeller] split out gradient tests from aiks_unittests

Author: gaaclarke

impeller/aiks/BUILD.gn

@@ -67,21 +67,44 @@ impeller_component("aiks_playground") {
   ]
 }
 
-impeller_component("aiks_unittests") {
+# All the source code to compile aiks_unittests.cc and its derivatives.
+source_set("aiks_unittests_source") {
   testonly = true
-
   sources = [
+    "aiks_gradient_unittests.cc",
     "aiks_unittests.cc",
-    "canvas_recorder_unittests.cc",
-    "canvas_unittests.cc",
+    "aiks_unittests.h",
     "testing/context_mock.h",
     "testing/context_spy.cc",
     "testing/context_spy.h",
+  ]
+  deps = [
+    ":aiks",
+    ":aiks_playground",
+    "//flutter/impeller/geometry:geometry_asserts",
+    "//flutter/impeller/golden_tests:golden_playground_test",
+    "//flutter/impeller/playground",
+    "//flutter/impeller/playground:playground_test",
+    "//flutter/impeller/scene",
+    "//flutter/impeller/typographer/backends/stb:typographer_stb_backend",
+    "//flutter/testing:testing_lib",
+    "//flutter/third_party/imgui",
+    "//flutter/third_party/txt",
+  ]
+}
+
+impeller_component("aiks_unittests") {
+  testonly = true
+
+  sources = [
+    "canvas_recorder_unittests.cc",
+    "canvas_unittests.cc",
     "trace_serializer_unittests.cc",
   ]
   deps = [
     ":aiks",
     ":aiks_playground",
+    ":aiks_unittests_source",
     "//flutter/impeller/geometry:geometry_asserts",
     "//flutter/impeller/golden_tests:golden_playground_test",
     "//flutter/impeller/playground:playground_test",
@@ -106,14 +129,14 @@ impeller_component("aiks_unittests_golden") {
   ]
 
   sources = [
-    "aiks_unittests.cc",
     "testing/context_mock.h",
     "testing/context_spy.cc",
     "testing/context_spy.h",
   ]
   deps = [
     ":aiks",
     ":aiks_playground",
+    ":aiks_unittests_source",
     "//flutter/impeller/geometry:geometry_asserts",
     "//flutter/impeller/golden_tests:golden_playground_test",
     "//flutter/impeller/playground:playground_test",