Add MinidumpMemoryWriter, MinidumpMemoryListWriter, and their test

minidump/minidump_writable_test.cc

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 115 matching lines @@
   void SetData(const std::string& string) { data_ = string; }
 
  protected:
   virtual size_t SizeOfObject() override {
     EXPECT_GE(state(), kStateFrozen);
     return data_.size();
   }
 
   virtual bool WriteObject(FileWriterInterface* file_writer) override {
     BaseTestMinidumpWritable::WriteObject(file_writer);
-    EXPECT_TRUE(file_writer->Write(&data_[0], data_.size()));
-    return true;
+    bool rv = file_writer->Write(&data_[0], data_.size());
+    EXPECT_TRUE(rv);
+    return rv;
   }
 
  private:
   std::string data_;
 
   DISALLOW_COPY_AND_ASSIGN(TestStringMinidumpWritable);
 };
 
 TEST(MinidumpWritable, MinidumpWritable) {
   StringFileWriter writer;
@@ skipping 677 matching lines @@
     EXPECT_STREQ("p", ldd->string);
     ldd = LDDAtIndex(writer.string(), 48);
     EXPECT_EQ(10u, ldd->location_descriptor.DataSize);
     EXPECT_EQ(12u, ldd->location_descriptor.Rva);
     EXPECT_STREQ("o", ldd->string);
     parent.Verify();
   }
 }
 
 }  // namespace