Add warning if an in-use Bitmap is reconfigured

Bug: 18928352

Also fix an issue around re-configure not properly handling
mPinnedCount in android::Bitmap

Change-Id: I1815b121f1474ad931060771bb1d52ef31d2aac7
diff --git a/core/jni/android/graphics/Graphics.cpp b/core/jni/android/graphics/Graphics.cpp
index 0deb8cc..1c6f7de 100644
--- a/core/jni/android/graphics/Graphics.cpp
+++ b/core/jni/android/graphics/Graphics.cpp
@@ -352,8 +352,8 @@
     getBitmap(env, bitmap)->getSkBitmap(outBitmap);
 }
 
-SkPixelRef* GraphicsJNI::getSkPixelRef(JNIEnv* env, jobject bitmap) {
-    return getBitmap(env, bitmap)->pixelRef();
+SkPixelRef* GraphicsJNI::refSkPixelRef(JNIEnv* env, jobject bitmap) {
+    return getBitmap(env, bitmap)->refPixelRef();
 }
 
 SkColorType GraphicsJNI::getNativeBitmapColorType(JNIEnv* env, jobject jconfig) {