[Android] Set --optimize-for-size JavaScript flag for low-end devices

content/renderer/render_process_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/render_process_impl.h"
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
@@ skipping 18 matching lines @@
 #include "ipc/ipc_message_utils.h"
 #include "skia/ext/platform_canvas.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
 #include "ui/surface/transport_dib.h"
 #include "webkit/glue/webkit_glue.h"
 
 #if defined(OS_MACOSX)
 #include "base/mac/mac_util.h"
 #endif
 
+#if defined(OS_ANDROID)
+#include "base/android/sys_utils.h"
+#endif
+
 namespace content {
 
 RenderProcessImpl::RenderProcessImpl()
     : shared_mem_cache_cleaner_(
           FROM_HERE, base::TimeDelta::FromSeconds(5),
           this, &RenderProcessImpl::ClearTransportDIBCache),
       transport_dib_next_sequence_number_(0),
       enabled_bindings_(0) {
   in_process_plugins_ = InProcessPlugins();
   for (size_t i = 0; i < arraysize(shared_mem_cache_); ++i)
@@ skipping 12 matching lines @@
     DCHECK(gdi_init_lpk);
     if (gdi_init_lpk) {
       gdi_init_lpk(0);
     }
   }
 #endif
 
   // Out of process dev tools rely upon auto break behavior.
   webkit_glue::SetJavaScriptFlags("--debugger-auto-break");
 
+#if defined(OS_ANDROID)
+  if (base::android::SysUtils::IsLowEndDevice())
+    webkit_glue::SetJavaScriptFlags("--optimize-for-size");
+#endif
+
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kJavaScriptFlags)) {
     webkit_glue::SetJavaScriptFlags(
         command_line.GetSwitchValueASCII(switches::kJavaScriptFlags));
   }
 
   // Turn on cross-site document blocking for renderer processes.
   SiteIsolationPolicy::SetPolicyEnabled(
       GetContentClient()->renderer()->ShouldEnableSiteIsolationPolicy());
 }
@@ skipping 165 matching lines @@
 void RenderProcessImpl::ClearTransportDIBCache() {
   for (size_t i = 0; i < arraysize(shared_mem_cache_); ++i) {
     if (shared_mem_cache_[i]) {
       FreeTransportDIB(shared_mem_cache_[i]);
       shared_mem_cache_[i] = NULL;
     }
   }
 }
 
 }  // namespace content