Remove tracking of content-supplied colors in canvas

https://bugs.webkit.org/show_bug.cgi?id=264786
rdar://118367460

Reviewed by Chris Dumez.

Updating m_suppliedColors shows up on profiles, and this is unused, so remove it.

* Source/WebCore/html/canvas/CanvasRenderingContext2DBase.cpp:
(WebCore::CanvasRenderingContext2DBase::setFillStyle):
* Source/WebCore/html/canvas/CanvasRenderingContext2DBase.h:
(WebCore::CanvasRenderingContext2DBase::suppliedColors const): Deleted.

Canonical link: https://commits.webkit.org/270686@main

Source/WebCore/html/canvas/CanvasRenderingContext2DBase.cpp

@@ -520,16 +520,9 @@ void CanvasRenderingContext2DBase::setFillStyle(CanvasStyle style)
     GraphicsContext* c = drawingContext();
     if (!c)
         return;
+
     state.fillStyle.applyFillColor(*c);
     state.unparsedFillColor = String();
-
-    if (!style.srgbaColor())
-        return;
-    if (auto color = style.srgbaColor()->tryGetAsSRGBABytes()) {
-        auto colorValue { PackedColor::RGBA { *color }.value };
-        if (m_suppliedColors.isValidValue(colorValue))
-            m_suppliedColors.add(colorValue);
-    }
 }
 
 void CanvasRenderingContext2DBase::setLineWidth(double width)

Source/WebCore/html/canvas/CanvasRenderingContext2DBase.h

@@ -234,8 +234,6 @@ class CanvasRenderingContext2DBase : public CanvasRenderingContext, public Canva
     using Direction = CanvasDirection;
     void setDirection(Direction);
 
-    const HashSet<uint32_t>& suppliedColors() const { return m_suppliedColors; }
-
     class FontProxy final : public FontSelectorClient {
     public:
         FontProxy() = default;
@@ -455,7 +453,6 @@ class CanvasRenderingContext2DBase : public CanvasRenderingContext, public Canva
     FloatRect m_dirtyRect;
     unsigned m_unrealizedSaveCount { 0 };
     bool m_usesCSSCompatibilityParseMode;
-    HashSet<uint32_t> m_suppliedColors;
     mutable std::optional<CachedImageData> m_cachedImageData;
     CanvasRenderingContext2DSettings m_settings;
 };