Update SkBitmap::validate to respect Android flag.

Without this change, an SkBitmap with hardware mip will assert in
validate.

R=djsollen@google.com

Review URL: https://codereview.chromium.org/16870002

git-svn-id: http://skia.googlecode.com/svn/trunk@9614 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/core/SkBitmap.cpp b/src/core/SkBitmap.cpp
index 122996a..b53e4bc 100644
--- a/src/core/SkBitmap.cpp
+++ b/src/core/SkBitmap.cpp
@@ -1625,7 +1625,11 @@
 void SkBitmap::validate() const {
     SkASSERT(fConfig < kConfigCount);
     SkASSERT(fRowBytes >= (unsigned)ComputeRowBytes((Config)fConfig, fWidth));
-    SkASSERT(fFlags <= (kImageIsOpaque_Flag | kImageIsVolatile_Flag | kImageIsImmutable_Flag));
+    uint8_t allFlags = kImageIsOpaque_Flag | kImageIsVolatile_Flag | kImageIsImmutable_Flag;
+#ifdef SK_BUILD_FOR_ANDROID
+    allFlags |= kHasHardwareMipMap_Flag;
+#endif
+    SkASSERT(fFlags <= allFlags);
     SkASSERT(fPixelLockCount >= 0);
     SkASSERT(NULL == fColorTable || (unsigned)fColorTable->getRefCnt() < 10000);
     SkASSERT((uint8_t)ComputeBytesPerPixel((Config)fConfig) == fBytesPerPixel);