Adds a flag "use_instrumented_libraries" and corresponding target with 2 simple libs

build/common.gypi

Index: build/common.gypi
===================================================================
--- build/common.gypi	(revision 231560)
+++ build/common.gypi	(working copy)
@@ -309,6 +309,10 @@
       # See http://clang.llvm.org/docs/MemorySanitizer.html
       'msan%': 0,
 
+      # Use the dynamic libraries instrumented by one of the sanitizers
+      # instead of the standard system libraries.
+      'use_instrumented_libraries%': 0,
+
       # Use a modified version of Clang to intercept allocated types and sizes
       # for allocated objects. clang_type_profiler=1 implies clang=1.
       # See http://dev.chromium.org/developers/deep-memory-profiler/cpp-object-type-identifier
@@ -840,6 +844,7 @@
     'msan%': '<(msan)',
     'tsan%': '<(tsan)',
     'tsan_blacklist%': '<(tsan_blacklist)',
+    'use_instrumented_libraries%': '<(use_instrumented_libraries)',
     'clang_type_profiler%': '<(clang_type_profiler)',
     'order_profiling%': '<(order_profiling)',
     'order_text_section%': '<(order_text_section)',
@@ -3366,6 +3371,24 @@
               }],
             ],
           }],
+          ['use_instrumented_libraries==1', {
+            'dependencies': [

[Nico, 2013/10/30 14:47:02]

Why do you always need this but the rpath bit only for asan?

[alextaran1, 2013/10/30 16:08:54]

We are going to have different instrumentation types (asan, msan, tsan).
Later we can check asan==1 or tsan==1 in instrumented_libraries.gyp to build
with right instrumentation.

+              '<(DEPTH)/third_party/instrumented_libraries/instrumented_libraries.gyp:instrumented_libraries',
+            ],
+            'conditions': [
+              ['asan==1', {
+                'target_conditions': [
+                  ['_toolset=="target"', {
+                    'ldflags': [
+                      # Add RPATH to result binary to make it linking instrumented libraries ($ORIGIN means relative RPATH)
+                      '-Wl,-R,\\$$ORIGIN/instrumented_libraries/asan/lib/:\\$$ORIGIN/instrumented_libraries/asan/usr/lib/x86_64-linux-gnu/',

[Nico, 2013/10/30 14:47:02]

Just one backslash in front of $ is enough (and consistent with how we spell it
in other place)

[alextaran1, 2013/10/30 16:08:54]

Done.

+                      '-Wl,-z,origin',
+                    ],
+                  }],
+                ],
+              }],
+            ],
+          }],
           ['order_profiling!=0 and (chromeos==1 or OS=="linux" or OS=="android")', {
             'target_conditions' : [
               ['_toolset=="target"', {