Make it possible to draw multiple paths at once to a draw target

src/gpu/GrDrawTarget.cpp

Index: src/gpu/GrDrawTarget.cpp
diff --git a/src/gpu/GrDrawTarget.cpp b/src/gpu/GrDrawTarget.cpp
index fb4c9a1509a4ffffce549d8fe3116c88f373b10e..35025420793c8e96d7449dfae6d6c78175f1680e 100644
--- a/src/gpu/GrDrawTarget.cpp
+++ b/src/gpu/GrDrawTarget.cpp
@@ -548,6 +548,36 @@ void GrDrawTarget::drawPath(const GrPath* path, SkPath::FillType fill) {
     this->onDrawPath(path, fill, dstCopy.texture() ? &dstCopy : NULL);
 }
 
+void GrDrawTarget::drawPaths(size_t pathCount, const GrPath** paths,
+                             const SkMatrix* transforms,
+                             SkPath::FillType fill, SkStrokeRec::Style stroke) {
+    SkASSERT(pathCount > 0);
+    SkASSERT(NULL != paths);
+    SkASSERT(NULL != paths[0]);
+    SkASSERT(this->caps()->pathRenderingSupport());
+    SkASSERT(!SkPath::IsInverseFillType(fill));
+
+    const GrDrawState* drawState = &getDrawState();
+
+    SkRect devBounds;
+    for (size_t i = 0; i < pathCount; ++i) {
+        SkRect mappedPathBounds;
+        transforms[i].mapRect(&mappedPathBounds, paths[i]->getBounds());
+        devBounds.join(mappedPathBounds);
+    }
+
+    SkMatrix viewM = drawState->getViewMatrix();
+    viewM.mapRect(&devBounds);
+
+    GrDeviceCoordTexture dstCopy;
+    if (!this->setupDstReadIfNecessary(&dstCopy, &devBounds)) {
+        return;
+    }
+
+    this->onDrawPaths(pathCount, paths, transforms, fill, stroke,
+                      dstCopy.texture() ? &dstCopy : NULL);
+}
+
 void GrDrawTarget::instantGpuTraceEvent(const char* marker) {
     if (this->caps()->gpuTracingSupport()) {
         this->onInstantGpuTraceEvent(marker);