Apply .globalAlpha to SVG-images painted using <canvas> drawImage()

Source/platform/graphics/GraphicsContext.h

Index: Source/platform/graphics/GraphicsContext.h
diff --git a/Source/platform/graphics/GraphicsContext.h b/Source/platform/graphics/GraphicsContext.h
index d217d6632099ec637575671676f28dc289cb5cb4..0fff8b250123fd44f01d3194bacf4463fa14ffaa 100644
--- a/Source/platform/graphics/GraphicsContext.h
+++ b/Source/platform/graphics/GraphicsContext.h
@@ -157,6 +157,7 @@ public:
     TextDrawingModeFlags textDrawingMode() const { return m_paintState->m_textDrawingMode; }
 
     void setAlpha(float alpha) { mutableState()->m_alpha = alpha;}
+    float alpha() const { return m_paintState->m_alpha; }
 
     void setImageInterpolationQuality(InterpolationQuality quality) { mutableState()->m_interpolationQuality = quality; }
     InterpolationQuality imageInterpolationQuality() const { return m_paintState->m_interpolationQuality; }