hide lockpixels api behind flag

guarded by SK_SUPPORT_OBSOLETE_LOCKPIXELS

needs https://codereview.chromium.org/2820873002/# to land first
Bug: skia:6481
Change-Id: I1c39902cbf6fe99f622adfa8192733b95f7fea09

Change-Id: I1c39902cbf6fe99f622adfa8192733b95f7fea09
Reviewed-on: https://skia-review.googlesource.com/13580
Reviewed-by: Florin Malita <fmalita@chromium.org>
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/include/core/SkBitmap.h b/include/core/SkBitmap.h
index 9520210..e19f452 100644
--- a/include/core/SkBitmap.h
+++ b/include/core/SkBitmap.h
@@ -217,8 +217,8 @@
      *  "unknown" pixels.
      */
     static bool ComputeIsOpaque(const SkBitmap& bm) {
-        SkAutoPixmapUnlock result;
-        return bm.requestLock(&result) && result.pixmap().computeIsOpaque();
+        SkPixmap pmap;
+        return bm.peekPixels(&pmap) && pmap.computeIsOpaque();
     }
 
     /**
@@ -419,10 +419,11 @@
      */
     void setPixelRef(sk_sp<SkPixelRef>, int dx, int dy);
 
+#ifdef SK_SUPPORT_OBSOLETE_LOCKPIXELS
     void lockPixels() const {}
     void unlockPixels() const {}
-
     bool requestLock(SkAutoPixmapUnlock* result) const;
+#endif
 
     /** Call this to be sure that the bitmap is valid enough to be drawn (i.e.
         it has non-null pixels, and if required by its colortype, it has a
@@ -755,26 +756,12 @@
     friend class SkBinaryWriteBuffer; // rawpixels
 };
 
+#ifdef SK_SUPPORT_OBSOLETE_LOCKPIXELS
 class SkAutoLockPixels : SkNoncopyable {
 public:
-    SkAutoLockPixels(const SkBitmap& bm, bool doLock = true) : fBitmap(bm) {
-        fDidLock = doLock;
-        if (doLock) {
-            bm.lockPixels();
-        }
-    }
-    ~SkAutoLockPixels() {
-        if (fDidLock) {
-            fBitmap.unlockPixels();
-        }
-    }
-
-private:
-    const SkBitmap& fBitmap;
-    bool            fDidLock;
+    SkAutoLockPixels(const SkBitmap&, bool = true) {}
 };
-//TODO(mtklein): uncomment when 71713004 lands and Chromium's fixed.
-//#define SkAutoLockPixels(...) SK_REQUIRE_LOCAL_VAR(SkAutoLockPixels)
+#endif
 
 ///////////////////////////////////////////////////////////////////////////////