Check whether Java bitmap memory size is same to one of SkBitmap

This is to understand why Issue 476559 is happening.

BUG=476559

Review URL: https://codereview.chromium.org/1136053003

Cr-Commit-Position: refs/heads/master@{#329288}

ui/android/java/src/org/chromium/ui/gfx/BitmapHelper.java

@@ -44,7 +44,7 @@ public class BitmapHelper {
         }
     }
 
-     /**
+    /**
      * Provides a matching Bitmap.Config for the enum config value passed.
      *
      * @param bitmapFormatValue The Bitmap Configuration enum value.
@@ -64,4 +64,8 @@ public class BitmapHelper {
         }
     }
 
+    @CalledByNative
+    private static int getByteCount(Bitmap bitmap) {
+        return bitmap.getByteCount();
+    }
 }

ui/gfx/android/java_bitmap.cc

@@ -29,6 +29,7 @@ JavaBitmap::JavaBitmap(jobject bitmap)
   size_ = gfx::Size(info.width, info.height);
   format_ = info.format;
   stride_ = info.stride;
+  byte_count_ = Java_BitmapHelper_getByteCount(AttachCurrentThread(), bitmap_);
 }
 
 JavaBitmap::~JavaBitmap() {
@@ -108,6 +109,7 @@ SkBitmap CreateSkBitmapFromJavaBitmap(const JavaBitmap& jbitmap) {
       CHECK(false) << "Invalid Java bitmap format: " << jbitmap.format();
       break;
   }
+  CHECK_EQ(jbitmap.byte_count(), static_cast<int>(skbitmap.getSize()));
   const void* src_pixels = jbitmap.pixels();
   void* dst_pixels = skbitmap.getPixels();
   memcpy(dst_pixels, src_pixels, skbitmap.getSize());

ui/gfx/android/java_bitmap.h

@@ -37,6 +37,7 @@ class GFX_EXPORT JavaBitmap {
   // Formats are in android/bitmap.h; e.g. ANDROID_BITMAP_FORMAT_RGBA_8888
   inline int format() const { return format_; }
   inline uint32_t stride() const { return stride_; }
+  inline int byte_count() const { return byte_count_; }
 
   // Registers methods with JNI and returns true if succeeded.
   static bool RegisterJavaBitmap(JNIEnv* env);
@@ -47,6 +48,7 @@ class GFX_EXPORT JavaBitmap {
   gfx::Size size_;
   int format_;
   uint32_t stride_;
+  int byte_count_;
 
   DISALLOW_COPY_AND_ASSIGN(JavaBitmap);
 };