add installPixels

BUG=skia:
R=halcanary@google.com

Review URL: https://codereview.chromium.org/143073008

git-svn-id: http://skia.googlecode.com/svn/trunk@13174 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/utils/debugger/SkDebugCanvas.cpp b/src/utils/debugger/SkDebugCanvas.cpp
index e491f3b..1c3e26e 100644
--- a/src/utils/debugger/SkDebugCanvas.cpp
+++ b/src/utils/debugger/SkDebugCanvas.cpp
@@ -74,8 +74,7 @@
 
 int SkDebugCanvas::getCommandAtPoint(int x, int y, int index) {
     SkBitmap bitmap;
-    bitmap.setConfig(SkBitmap::kARGB_8888_Config, 1, 1);
-    bitmap.allocPixels();
+    bitmap.allocPixels(SkImageInfo::MakeN32Premul(1, 1));
 
     SkCanvas canvas(bitmap);
     canvas.translate(SkIntToScalar(-x), SkIntToScalar(-y));