Android: Add chrome-specific dynamic linker.

build/android/pylib/linker/test_case.py

Index: build/android/pylib/linker/test_case.py
diff --git a/build/android/pylib/linker/test_case.py b/build/android/pylib/linker/test_case.py
index b8a256676341f90169677342d5c8983e293566ce..d44c52d6f4b543488b7295f70b11c73a0f3eaf20 100644
--- a/build/android/pylib/linker/test_case.py
+++ b/build/android/pylib/linker/test_case.py
@@ -52,6 +52,10 @@ _PACKAGE_NAME='org.chromium.content_linker_test_apk'
 _ACTIVITY_NAME='.ContentLinkerTestActivity'
 _COMMAND_LINE_FILE='/data/local/tmp/content-linker-test-command-line'
 
+# Set this to False if the implemetation doesn't always place Shared RELROs
+# in the browser process.
+_BROWSER_USES_SHARED_RELRO = True
+
 # Logcat filters used during each test. Only the 'chromium' one is really
 # needed, but the logs are added to the TestResult in case of error, and
 # it is handy to have the 'content_android_linker' ones as well when
@@ -401,10 +405,9 @@ class LinkerLibraryAddressTest(LinkerTestCaseBase):
       logging.error('Renderer libraries loaded at high addresses: %s', bad_libs)
       return ResultType.FAIL, logs
 
-    if self.is_low_memory:
-      # For low-memory devices, the libraries must all be loaded at the same
-      # addresses. This also implicitly checks that the browser libraries are at
-      # low addresses.
+    if _BROWSER_USES_SHARED_RELRO or self.is_low_memory:
+      # The libraries must all be loaded at the same addresses. This also
+      # implicitly checks that the browser libraries are at low addresses.
       addr_mismatches = []
       for lib_name, lib_address in browser_libs.iteritems():
         lib_address2 = renderer_libs[lib_name]
@@ -416,10 +419,10 @@ class LinkerLibraryAddressTest(LinkerTestCaseBase):
             addr_mismatches)
         return ResultType.FAIL, logs
 
-    # For regular devices, check that libraries are loaded at 'high-addresses'.
+    # Otherwise, check that libraries are loaded at 'high-addresses'.
     # Note that for low-memory devices, the previous checks ensure that they
     # were loaded at low-addresses.
-    if not self.is_low_memory:
+    else:
       bad_libs = []
       for lib_name, lib_address in browser_libs.iteritems():
         if lib_address < memory_boundary:
@@ -474,7 +477,7 @@ class LinkerRandomizationTest(LinkerTestCaseBase):
         renderer_lib_map_list, 'Renderer')
 
     if not browser_status:
-      if self.is_low_memory:
+      if _BROWSER_USES_SHARED_RELRO or self.is_low_memory:
           return ResultType.FAIL, browser_logs
 
       # IMPORTANT NOTE: The system's ASLR implementation seems to be very poor