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

Source/platform/graphics/GraphicsContext.h

 /*
  * Copyright (C) 2003, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008-2009 Torch Mobile, Inc.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 139 matching lines @@
     bool shouldSmoothFonts() const { return m_paintState->m_shouldSmoothFonts; }
 
     // Turn off LCD text for the paint if not supported on this context.
     void adjustTextRenderMode(SkPaint*);
     bool couldUseLCDRenderedText();
 
     void setTextDrawingMode(TextDrawingModeFlags mode) { mutableState()->m_textDrawingMode = mode; }
     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; }
 
     void setCompositeOperation(CompositeOperator, blink::WebBlendMode = blink::WebBlendModeNormal);
     CompositeOperator compositeOperation() const { return m_paintState->m_compositeOperator; }
     blink::WebBlendMode blendModeOperation() const { return m_paintState->m_blendMode; }
 
     // Change the way document markers are rendered.
     // Any deviceScaleFactor higher than 1.5 is enough to justify setting this flag.
@@ skipping 338 matching lines @@
     // FIXME: Make this go away: crbug.com/236892
     bool m_updatingControlTints : 1;
     bool m_accelerated : 1;
     bool m_isCertainlyOpaque : 1;
     bool m_printing : 1;
 };
 
 } // namespace WebCore
 
 #endif // GraphicsContext_h