Make --gdb work for android

shell/context.cc

Index: shell/context.cc
diff --git a/shell/context.cc b/shell/context.cc
index c10841c221271419f0fe99dec0dfe86eaaee3606..74184eb1d00983a0bd9f2224618658d518c0df7e 100644
--- a/shell/context.cc
+++ b/shell/context.cc
@@ -6,6 +6,7 @@
 
 #include <vector>
 
+#include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ -151,6 +152,9 @@ bool Context::Init() {
 
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 
+  if (command_line->HasSwitch(switches::kWaitForDebugger))

[qsr, 2015/01/16 00:04:18]

You should be able to do this at the very start of this method. I can
definitively see EnsureEmbedderIsInitialized(); needing debugging.

[eseidel, 2015/01/16 00:14:05]

Assuming it's safe to call the command line before the embedder is initialized,
sure.  Done.

+    base::debug::WaitForDebugger(60, true);
+
   if (command_line->HasSwitch(switches::kEnableExternalApplications)) {
     listener_ = ExternalApplicationListener::Create(
         task_runners_->shell_runner(), task_runners_->io_runner());