[Android] Sets up a coverage system for java using EMMA

content/content_shell.gypi

Index: content/content_shell.gypi
diff --git a/content/content_shell.gypi b/content/content_shell.gypi
index ae9012e96fdb2b30887a055c7c3df7ad5adc3209..97d602b506f494c1b5f4b4cb31e47a13dab2fd9a 100644
--- a/content/content_shell.gypi
+++ b/content/content_shell.gypi
@@ -696,6 +696,7 @@
             'has_java_resources': 1,
             'R_package': 'org.chromium.content_shell',
             'R_package_relpath': 'org/chromium/content_shell',
+            'emma_instrument': '<(emma_coverage)',
           },
           'includes': [ '../build/java.gypi' ],
         },
@@ -733,6 +734,7 @@
             'native_lib_target': 'libcontent_shell_content_view',
             'additional_input_paths': ['<(PRODUCT_DIR)/content_shell/assets/content_shell.pak'],
             'asset_location': '<(ant_build_out)/content_shell/assets',
+            'emma_instrument': '<(emma_coverage)',
           },
           'conditions': [
             ['android_webview_build==0', {