Make it possible to have 1 PpapiGlobals per thread. Update unit tests.

ppapi/proxy/ppapi_proxy_test.h

Index: ppapi/proxy/ppapi_proxy_test.h
diff --git a/ppapi/proxy/ppapi_proxy_test.h b/ppapi/proxy/ppapi_proxy_test.h
index 2a612ed73a6f81bea858e41d62cd8941ec02ecb4..348471fd321c3354351f1c8cd58e53fdf78de2ac 100644
--- a/ppapi/proxy/ppapi_proxy_test.h
+++ b/ppapi/proxy/ppapi_proxy_test.h
@@ -17,6 +17,8 @@
 #include "ppapi/proxy/plugin_proxy_delegate.h"
 #include "ppapi/proxy/plugin_resource_tracker.h"
 #include "ppapi/proxy/plugin_var_tracker.h"
+#include "ppapi/shared_impl/ppapi_shared_export.h"
+#include "ppapi/shared_impl/test_globals.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace ppapi {
@@ -33,6 +35,7 @@ class ProxyTestHarnessBase {
   PP_Instance pp_instance() const { return pp_instance_; }
   IPC::TestSink& sink() { return sink_; }
 
+  virtual PpapiGlobals* GetGlobals() = 0;
   // Returns either the plugin or host dispatcher, depending on the test.
   virtual Dispatcher* GetDispatcher() = 0;
 
@@ -88,6 +91,7 @@ class PluginProxyTestHarness : public ProxyTestHarnessBase {
   }
 
   // ProxyTestHarnessBase implementation.
+  virtual PpapiGlobals* GetGlobals() { return &plugin_globals_; }
   virtual Dispatcher* GetDispatcher();
   virtual void SetUpHarness();
   virtual void SetUpHarnessWithChannel(const IPC::ChannelHandle& channel_handle,
@@ -139,7 +143,8 @@ class PluginProxyTestHarness : public ProxyTestHarnessBase {
   PluginDelegateMock plugin_delegate_mock_;
 };
 
-class PluginProxyTest : public PluginProxyTestHarness, public testing::Test {
+class PPAPI_SHARED_EXPORT PluginProxyTest
+    : public PluginProxyTestHarness, public testing::Test {
  public:
   PluginProxyTest();
   virtual ~PluginProxyTest();
@@ -156,9 +161,14 @@ class HostProxyTestHarness : public ProxyTestHarnessBase {
   HostProxyTestHarness();
   virtual ~HostProxyTestHarness();
 
+  ppapi::TestGlobals* host_globals() { return &host_globals_; }
   HostDispatcher* host_dispatcher() { return host_dispatcher_.get(); }
+  VarTracker& var_tracker() {
+    return *host_globals_.GetVarTracker();
+  }
 
   // ProxyTestBase implementation.
+  virtual PpapiGlobals* GetGlobals() { return &host_globals_; }
   virtual Dispatcher* GetDispatcher();
   virtual void SetUpHarness();
   virtual void SetUpHarnessWithChannel(const IPC::ChannelHandle& channel_handle,
@@ -191,11 +201,13 @@ class HostProxyTestHarness : public ProxyTestHarnessBase {
   };
 
  private:
+  ppapi::TestGlobals host_globals_;
   scoped_ptr<HostDispatcher> host_dispatcher_;
   DelegateMock delegate_mock_;
 };
 
-class HostProxyTest : public HostProxyTestHarness, public testing::Test {
+class PPAPI_SHARED_EXPORT HostProxyTest
+    : public HostProxyTestHarness, public testing::Test {
  public:
   HostProxyTest();
   virtual ~HostProxyTest();
@@ -208,7 +220,7 @@ class HostProxyTest : public HostProxyTestHarness, public testing::Test {
 };
 
 // Use this base class to test both sides of a proxy.
-class TwoWayTest : public testing::Test {
+class PPAPI_SHARED_EXPORT TwoWayTest : public testing::Test {
  public:
   enum TwoWayTestMode {
     TEST_PPP_INTERFACE,