Add calls to EnsureGPUMemoryAvailable into GLES2DecoderImpl

content/common/gpu/gpu_command_buffer_stub.cc

Index: content/common/gpu/gpu_command_buffer_stub.cc
diff --git a/content/common/gpu/gpu_command_buffer_stub.cc b/content/common/gpu/gpu_command_buffer_stub.cc
index 707d50796adcf1929baef57e62d2fc465060959e..a0a79bc9f6ed05797650daa42ac75291ba1b6f83 100644
--- a/content/common/gpu/gpu_command_buffer_stub.cc
+++ b/content/common/gpu/gpu_command_buffer_stub.cc
@@ -56,6 +56,10 @@ class GpuCommandBufferMemoryTracker : public gpu::gles2::MemoryTracker {
         old_size, new_size, pool);
   }
 
+  virtual bool EnsureGPUMemoryAvailable(size_t size_needed) {
+    return tracking_group_->EnsureGPUMemoryAvailable(size_needed);
+  };
+
  private:
   ~GpuCommandBufferMemoryTracker() {
   }