Revert of Return color shader instead of 2-color gradient when color count is 1

src/effects/gradients/SkGradientShader.cpp

Index: src/effects/gradients/SkGradientShader.cpp
diff --git a/src/effects/gradients/SkGradientShader.cpp b/src/effects/gradients/SkGradientShader.cpp
index 3b761a51cadabba2175375df9b5292f66470c344..6ffe56b9d4299d7c80a1312b5a8c0d6c2514e728 100644
--- a/src/effects/gradients/SkGradientShader.cpp
+++ b/src/effects/gradients/SkGradientShader.cpp
@@ -742,6 +742,18 @@
     return nullptr != colors && count >= 1 && tileMode < (unsigned)SkShader::kTileModeCount;
 }
 
+// assumes colors is SkColor* and pos is SkScalar*
+#define EXPAND_1_COLOR(count)               \
+    SkColor tmp[2];                         \
+    do {                                    \
+        if (1 == count) {                   \
+            tmp[0] = tmp[1] = colors[0];    \
+            colors = tmp;                   \
+            pos = nullptr;                     \
+            count = 2;                      \
+        }                                   \
+    } while (0)
+
 static void desc_init(SkGradientShaderBase::Descriptor* desc,
                       const SkColor colors[], const SkScalar pos[], int colorCount,
                       SkShader::TileMode mode, uint32_t flags, const SkMatrix* localMatrix) {
@@ -767,9 +779,7 @@
     if (!valid_grad(colors, pos, colorCount, mode)) {
         return nullptr;
     }
-    if (1 == colorCount) {
-        return SkShader::MakeColorShader(colors[0]);
-    }
+    EXPAND_1_COLOR(colorCount);
 
     SkGradientShaderBase::Descriptor desc;
     desc_init(&desc, colors, pos, colorCount, mode, flags, localMatrix);
@@ -788,9 +798,7 @@
     if (!valid_grad(colors, pos, colorCount, mode)) {
         return nullptr;
     }
-    if (1 == colorCount) {
-        return SkShader::MakeColorShader(colors[0]);
-    }
+    EXPAND_1_COLOR(colorCount);
 
     SkGradientShaderBase::Descriptor desc;
     desc_init(&desc, colors, pos, colorCount, mode, flags, localMatrix);
@@ -818,9 +826,8 @@
             return SkShader::MakeEmptyShader();
         }
     }
-    if (1 == colorCount) {
-        return SkShader::MakeColorShader(colors[0]);
-    }
+
+    EXPAND_1_COLOR(colorCount);
 
     bool flipGradient = startRadius > endRadius;
 
@@ -860,9 +867,7 @@
     if (!valid_grad(colors, pos, colorCount, SkShader::kClamp_TileMode)) {
         return nullptr;
     }
-    if (1 == colorCount) {
-        return SkShader::MakeColorShader(colors[0]);
-    }
+    EXPAND_1_COLOR(colorCount);
 
     SkGradientShaderBase::Descriptor desc;
     desc_init(&desc, colors, pos, colorCount, SkShader::kClamp_TileMode, flags, localMatrix);