GpuMemoryManager should limit memory allocations based on viewport size for android.

content/common/gpu/gpu_command_buffer_stub.h

Index: content/common/gpu/gpu_command_buffer_stub.h
diff --git a/content/common/gpu/gpu_command_buffer_stub.h b/content/common/gpu/gpu_command_buffer_stub.h
index 892c0d9ae39b35a6ea24c9577ecc41566c7ca9b7..2cda614513c7264ec6fb789e6ffb7dd0da7ef01a 100644
--- a/content/common/gpu/gpu_command_buffer_stub.h
+++ b/content/common/gpu/gpu_command_buffer_stub.h
@@ -67,6 +67,8 @@ class CONTENT_EXPORT GpuCommandBufferStubBase {
   virtual bool has_surface_state() const = 0;
   virtual const SurfaceState& surface_state() const = 0;
 
+  virtual gfx::Size GetSurfaceSize() const = 0;
+
   virtual bool IsInSameContextShareGroup(
       const GpuCommandBufferStubBase& other) const = 0;
 
@@ -120,6 +122,9 @@ class GpuCommandBufferStub
   virtual const GpuCommandBufferStubBase::SurfaceState& surface_state() const
       OVERRIDE;
 
+  // Returns surface size.
+  virtual gfx::Size GetSurfaceSize() const OVERRIDE;
+
   // Returns true iff |other| is in the same context share group as this stub.
   virtual bool IsInSameContextShareGroup(
       const GpuCommandBufferStubBase& other) const OVERRIDE;