Check dimensions and content of bitmaps in EmbedderTests.

testing/embedder_test.h

Index: testing/embedder_test.h
diff --git a/testing/embedder_test.h b/testing/embedder_test.h
index dc4ca0dc08c5f4f41577c617fecfea5a0185b947..cc0caec8f63b32c4b968a52abba61c4ada1068c5 100644
--- a/testing/embedder_test.h
+++ b/testing/embedder_test.h
@@ -105,6 +105,12 @@ class EmbedderTest : public ::testing::Test,
   // is prohibited after this call is made.
   virtual void UnloadPage(FPDF_PAGE page);
 
+  // Check |bitmap| to make sure it has the right dimensions and content.
+  static void CompareBitmap(FPDF_BITMAP bitmap,
+                            int expected_width,
+                            int expected_height,
+                            const char* expected_md5sum);
+
  protected:
   void SetupFormFillEnvironment();