Add multi-planar functions to GpuMemoryBuffer

gpu/command_buffer/tests/gl_manager.cc

Index: gpu/command_buffer/tests/gl_manager.cc
diff --git a/gpu/command_buffer/tests/gl_manager.cc b/gpu/command_buffer/tests/gl_manager.cc
index 4e4eccb2abed4026fc23ec1c918f52a9f3af8d74..9361095c76551c360c2ff417b095e380aa3a31bc 100644
--- a/gpu/command_buffer/tests/gl_manager.cc
+++ b/gpu/command_buffer/tests/gl_manager.cc
@@ -76,12 +76,21 @@ class GpuMemoryBufferImpl : public gfx::GpuMemoryBuffer {
     mapped_ = true;
     return &bytes_->data().front();
   }
+  void* Map(size_t plane_index) override {
+    CHECK_EQ(plane_index, 0u);
+    return Map();
+  }
   void Unmap() override { mapped_ = false; }
   bool IsMapped() const override { return mapped_; }
+  size_t GetNumberOfPlanes() const override { return 1; }
   Format GetFormat() const override { return format_; }
   uint32 GetStride() const override {
     return StrideInBytes(size_.width(), format_);
   }
+  uint32 GetStride(size_t plane_index) const override {
+    CHECK_EQ(plane_index, 0u);
+    return GetStride();
+  }
   gfx::GpuMemoryBufferHandle GetHandle() const override {
     NOTREACHED();
     return gfx::GpuMemoryBufferHandle();