Adds MemoryPressureListener.

base/base.gyp

Index: base/base.gyp
diff --git a/base/base.gyp b/base/base.gyp
index 19e8af177ab7b522a47d3f3686fc5a79018f1e95..bd14427fc52d00c4135b509aea53c08872fc8ca1 100644
--- a/base/base.gyp
+++ b/base/base.gyp
@@ -1132,6 +1132,7 @@
             'android/java/src/org/chromium/base/BuildInfo.java',
             'android/java/src/org/chromium/base/CpuFeatures.java',
             'android/java/src/org/chromium/base/ImportantFileWriterAndroid.java',
+            'android/java/src/org/chromium/base/MemoryPressure.java',
             'android/java/src/org/chromium/base/PathService.java',
             'android/java/src/org/chromium/base/PathUtils.java',
             'android/java/src/org/chromium/base/PowerMonitor.java',
@@ -1158,6 +1159,7 @@
           },
           'dependencies': [
             'base_java_activity_state',
+            'base_java_memory_pressure_level_list',
           ],
           'includes': [ '../build/java.gypi' ],
           'conditions': [
@@ -1185,6 +1187,18 @@
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
         {
+          'target_name': 'base_java_memory_pressure_level_list',
+          'type': 'none',
+          'sources': [
+            'android/java/src/org/chromium/base/MemoryPressureLevelList.template',
+          ],
+          'variables': {
+            'package_name': 'org/chromium/base',
+            'template_deps': ['memory/memory_pressure_level_list.h'],
+          },
+          'includes': [ '../build/android/java_cpp_template.gypi' ],
+        },
+        {
           'target_name': 'base_java_test_support',
           'type': 'none',
           'dependencies': [