Increase VM memory for the gradle daemon.

This also improved the printing of exec commands for easier copy/paste.

Change-Id: I584644969bc999cdc108b65258b95f248f4adff2
diff --git a/build.gradle b/build.gradle
index 51b7df0..171ede1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -2356,7 +2356,7 @@
 allprojects {
   tasks.withType(Exec) {
     doFirst {
-      println commandLine
+      println commandLine.join(' ')
     }
   }
 }
\ No newline at end of file
diff --git a/tools/gradle.py b/tools/gradle.py
index 0e926e6..a52e3f3 100755
--- a/tools/gradle.py
+++ b/tools/gradle.py
@@ -41,6 +41,7 @@
 def GetJavaEnv(env):
   java_env = dict(env if env else os.environ, JAVA_HOME = jdk.GetJdkHome())
   java_env['PATH'] = java_env['PATH'] + os.pathsep + os.path.join(jdk.GetJdkHome(), 'bin')
+  java_env['GRADLE_OPTS'] = '-Xmx1g'
   return java_env
 
 def PrintCmd(s):