Create first pdfium embedder test.

testing/basic_embeddertest.cpp

Index: testing/basic_embeddertest.cpp
diff --git a/testing/basic_embeddertest.cpp b/testing/basic_embeddertest.cpp
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+// Copyright (c) 2015 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "embedder_test.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+class BasicEmbeddertest : public EmbedderTest {
+};
+
+TEST_F(BasicEmbeddertest, GetPageCount) {
+  EXPECT_TRUE(OpenDocument("testing/resources/about_blank.pdf"));
+  EXPECT_EQ(1, GetPageCount());
+}
+
+TEST_F(BasicEmbeddertest, GetFirstPageNum) {
+  EXPECT_TRUE(OpenDocument("testing/resources/about_blank.pdf"));
+  EXPECT_EQ(0, GetFirstPageNum());
+}