Use newImageSnapshot() to get an image from a Canvas

Source/platform/graphics/GraphicsContext.cpp

Index: Source/platform/graphics/GraphicsContext.cpp
diff --git a/Source/platform/graphics/GraphicsContext.cpp b/Source/platform/graphics/GraphicsContext.cpp
index 8aed1412403504887e2bfc5ad5e1b4af336df393..717d3d55448adf48282121b6323cdb67a3daa85e 100644
--- a/Source/platform/graphics/GraphicsContext.cpp
+++ b/Source/platform/graphics/GraphicsContext.cpp
@@ -267,7 +267,10 @@ void GraphicsContext::setStrokePattern(PassRefPtr<Pattern> pattern)
         setStrokeColor(Color::black);
         return;
     }
-    mutableState()->setStrokePattern(pattern);
+
+    SkShader::ShaderLocation preferredLocation = isAccelerated() ? SkShader::kGPU_ShaderLocation : SkShader::kCPU_ShaderLocation;
+
+    mutableState()->setStrokePattern(pattern, preferredLocation);
 }
 
 void GraphicsContext::setStrokeGradient(PassRefPtr<Gradient> gradient)
@@ -294,7 +297,9 @@ void GraphicsContext::setFillPattern(PassRefPtr<Pattern> pattern)
         return;
     }
 
-    mutableState()->setFillPattern(pattern);
+    SkShader::ShaderLocation preferredLocation = isAccelerated() ? SkShader::kGPU_ShaderLocation : SkShader::kCPU_ShaderLocation;
+
+    mutableState()->setFillPattern(pattern, preferredLocation);
 }
 
 void GraphicsContext::setFillGradient(PassRefPtr<Gradient> gradient)