PPAPI: Make GLES2 calls resilient to bad/dead resources.

ppapi/shared_impl/ppb_graphics_3d_shared.cc

Index: ppapi/shared_impl/ppb_graphics_3d_shared.cc
diff --git a/ppapi/shared_impl/ppb_graphics_3d_shared.cc b/ppapi/shared_impl/ppb_graphics_3d_shared.cc
index 1f412d80b2c0cfad656e4eb89500a7b34ec1b6c5..0f39663d6ed11ea6f88fc05f8819185d795a094d 100644
--- a/ppapi/shared_impl/ppb_graphics_3d_shared.cc
+++ b/ppapi/shared_impl/ppb_graphics_3d_shared.cc
@@ -50,7 +50,6 @@ int32_t PPB_Graphics3D_Shared::ResizeBuffers(int32_t width, int32_t height) {
   if ((width < 0) || (height < 0))
     return PP_ERROR_BADARGUMENT;
 
-  ScopedNoLocking already_locked(this);
   gles2_impl()->ResizeCHROMIUM(width, height, 1.f);
   // TODO(alokp): Check if resize succeeded and return appropriate error code.
   return PP_OK;
@@ -58,7 +57,6 @@ int32_t PPB_Graphics3D_Shared::ResizeBuffers(int32_t width, int32_t height) {
 
 int32_t PPB_Graphics3D_Shared::SwapBuffers(
     scoped_refptr<TrackedCallback> callback) {
-  ScopedNoLocking already_locked(this);
   if (HasPendingSwap()) {
     Log(PP_LOGLEVEL_ERROR, "PPB_Graphics3D.SwapBuffers: Plugin attempted swap "
                            "with previous swap still pending.");
@@ -85,13 +83,11 @@ void* PPB_Graphics3D_Shared::MapTexSubImage2DCHROMIUM(GLenum target,
                                                       GLenum format,
                                                       GLenum type,
                                                       GLenum access) {
-  ScopedNoLocking already_locked(this);
   return gles2_impl_->MapTexSubImage2DCHROMIUM(
       target, level, xoffset, yoffset, width, height, format, type, access);
 }
 
 void PPB_Graphics3D_Shared::UnmapTexSubImage2DCHROMIUM(const void* mem) {
-  ScopedNoLocking already_locked(this);
   gles2_impl_->UnmapTexSubImage2DCHROMIUM(mem);
 }
 
@@ -108,7 +104,6 @@ bool PPB_Graphics3D_Shared::CreateGLES2Impl(
     int32 command_buffer_size,
     int32 transfer_buffer_size,
     gpu::gles2::GLES2Implementation* share_gles2) {
-  ScopedNoLocking already_locked(this);
   gpu::CommandBuffer* command_buffer = GetCommandBuffer();
   DCHECK(command_buffer);
 
@@ -145,19 +140,10 @@ bool PPB_Graphics3D_Shared::CreateGLES2Impl(
 }
 
 void PPB_Graphics3D_Shared::DestroyGLES2Impl() {
-  ScopedNoLocking already_locked(this);
   gles2_impl_.reset();
   transfer_buffer_.reset();
   gles2_helper_.reset();
 }
 
-void PPB_Graphics3D_Shared::PushAlreadyLocked() {
-  // Do nothing. This should be overridden in the plugin side.
-}
-
-void PPB_Graphics3D_Shared::PopAlreadyLocked() {
-  // Do nothing. This should be overridden in the plugin side.
-}
-
 }  // namespace ppapi