Retire setGradientSpaceTransform, setPatternSpaceTransform

third_party/WebKit/Source/platform/graphics/Pattern.cpp

Index: third_party/WebKit/Source/platform/graphics/Pattern.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/Pattern.cpp b/third_party/WebKit/Source/platform/graphics/Pattern.cpp
index 2c279181992ab079aebd65cf407deb037821f2e2..608ef881bc8e43f1e4577ebbad6965385d25f701 100644
--- a/third_party/WebKit/Source/platform/graphics/Pattern.cpp
+++ b/third_party/WebKit/Source/platform/graphics/Pattern.cpp
@@ -60,21 +60,28 @@ Pattern::~Pattern()
     adjustExternalMemoryAllocated(-m_externalMemoryAllocated);
 }
 
-void Pattern::applyToPaint(SkPaint& paint)
+namespace {
+
+inline bool cachedShaderIsValid(const sk_sp<SkShader>& shader, const SkMatrix* matrix)
 {
-    if (!m_pattern)
-        m_pattern = createShader();
+    if (!shader)
+        return false;
+
+    const SkMatrix& shaderLocalMatrix = shader->getLocalMatrix();
+    if (!matrix)
+        return shaderLocalMatrix.isIdentity();
 
-    paint.setShader(m_pattern);
+    return shaderLocalMatrix == *matrix;
 }
 
-void Pattern::setPatternSpaceTransform(const AffineTransform& patternSpaceTransformation)
+} // anonymous namespace
+
+void Pattern::applyToPaint(SkPaint& paint, const SkMatrix* localMatrix) const
 {
-    if (patternSpaceTransformation == m_patternSpaceTransformation)
-        return;
+    if (!cachedShaderIsValid(m_cachedShader, localMatrix))
+        m_cachedShader = createShader(localMatrix);
 
-    m_patternSpaceTransformation = patternSpaceTransformation;
-    m_pattern.reset();
+    paint.setShader(m_cachedShader);
 }
 
 void Pattern::adjustExternalMemoryAllocated(int64_t delta)