Fix a batch of coverity defects, uninitialized class fields.

In SkClipStack::B2FIter::Clip, SkWriter32, SkClipStack::Rec, SkDeque::F2BIter, SkPDFShader::State
CID 15427,15433,15533,15532,16274,16740

Review URL: http://codereview.appspot.com/4630055

git-svn-id: http://skia.googlecode.com/svn/trunk@1669 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/pdf/SkPDFShader.cpp b/src/pdf/SkPDFShader.cpp
index 6845e09..1f58f1f 100644
--- a/src/pdf/SkPDFShader.cpp
+++ b/src/pdf/SkPDFShader.cpp
@@ -749,12 +749,13 @@
 SkPDFShader::State::State(const SkShader& shader,
                           const SkMatrix& canvasTransform, const SkIRect& bbox)
         : fCanvasTransform(canvasTransform),
-          fBBox(bbox) {
-
+          fBBox(bbox),
+          fPixelGeneration(0) {
     fInfo.fColorCount = 0;
     fInfo.fColors = NULL;
     fInfo.fColorOffsets = NULL;
     shader.getLocalMatrix(&fShaderTransform);
+    fImageTileModes[0] = fImageTileModes[1] = SkShader::kClamp_TileMode;
 
     fType = shader.asAGradient(&fInfo);