Breakpad Linux dumper: Add unit tests for google_breakpad::Module.

Adjust Module's interface a bit to facilitate testing:
- Make AssignSourceIds something a client can call --- it's perfectly
  well-defined, so this is an okay change.
- Add GetFunctions, GetFiles and FindExistingfile member functions,
  which the test harness will use to get results to examine.

a=jimblandy, r=nealsid


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@466 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/tools/linux/dump_syms/Makefile

@@ -52,7 +52,8 @@ SRC = ../../..
 # dependencies using $(CXX). Value accumulated throughout the file.
 CPP_EXECUTABLES = 
 
-# Source files whose coverage we are interested in. Value accumulated
+# Add the names of source files whose coverage you'd like 'make
+# coverage' to report on to this variable. Value accumulated
 # throughout the file.
 COVERAGE_SOURCES = 
 
@@ -79,6 +80,7 @@ dump_stabs.o: dump_stabs.cc
 dump_symbols.o: dump_symbols.cc
 file_id.o: file_id.cc
 module.o: module.cc
+COVERAGE_SOURCES += module.cc
 stabs_reader.o: stabs_reader.cc
 COVERAGE_SOURCES += stabs_reader.cc
 
@@ -132,6 +134,22 @@ clean::
 	rm -f file_id_unittest
 
 
+### Unit tests for google_breakpad::Module.
+check: check-module_unittest
+check-module_unittest: module_unittest
+module_unittest:				\
+	gtest-all.o				\
+	gtest_main.o				\
+	module.o				\
+	module_unittest.o			\
+	$(empty)
+CPP_EXECUTABLES += module_unittest
+module_unittest.o: module_unittest.cc
+module_unittest.o: override CPPFLAGS += $(GTEST_CPPFLAGS) $(GMOCK_CPPFLAGS)
+clean::
+	rm -f module_unittest
+
+
 ### Generic compilation rules.
 
 # Link C++ executables using the C++ compiler; see CPP_EXECUTABLES above.