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 +309,9 @@
       # See http://clang.llvm.org/docs/MemorySanitizer.html
       'msan%': 0,
 
+      # Enable use pre-built instrumented system libs by sanitizer instead of standard libs

[Alexander Potapenko, 2013/10/29 13:36:11]

Please make sure you stay below the 80-column limit.
Also, this comment should end with a period.

[Alexander Potapenko, 2013/10/29 13:36:11]

How about "Use the libraries instrumented by one of the sanitizers instead of
the standard system libraries"?

[alextaran1, 2013/10/30 11:16:29]

Thanks, that's much better

[alextaran1, 2013/10/30 11:16:29]

There are too many lines in common.gypi which have length >80 symbols

+      '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 +843,7 @@
     '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 +3370,23 @@
               }],
             ],
           }],
+          ['use_instrumented_libraries==1', {
+            'dependencies': [
+              '<(DEPTH)/third_party/instrumented_libraries/instrumented_libraries.gyp:instrumented_libraries',
+            ],
+            'conditions': [
+              ['asan==1', {
+                'target_conditions': [
+                  ['_toolset=="target"', {
+                    'ldflags': [
+                      '-Wl,-R,\\$$ORIGIN/instrumented_libraries/asan/lib/:\\$$ORIGIN/instrumented_libraries/asan/usr/lib/x86_64-linux-gnu/',

[Alexander Potapenko, 2013/10/29 13:36:11]

Pls add a comment for these flags.

[alextaran1, 2013/10/30 11:16:29]

Done.

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